The document discusses a study on aluminium-fly ash composites fabricated using a two-step stir casting method. Fly ash particles were added to molten aluminum at different weight percentages between 5-25% to produce composites. The composites were then evaluated for their microstructure, mechanical, wear and corrosion properties. Key results showed that hardness, tensile strength and compressive strength increased with fly ash content up to 20% due to the hard fly ash particles resisting deformation. However, properties started decreasing beyond 20% fly ash due to increased porosity and particle clustering. Density of the composites also decreased linearly with the addition of fly ash particles which have a lower density than aluminum.
Using the scholar data and researcher point of view on composite materials. We illustrate the application of composite material in aerospace industry. Composites are highly efficient to make the parts and structure of aircrafts. We found the characteristics of the composite material make it very suitable material for aerospace industry. Composites like carbon fiber, carbon epoxy, and glass epoxy are very light and high strength which is mostly used in aircraft industries. In addition, our study takes the first step to highlight the uses of composite material to manufacture the different parts of aircraft's.
APPLICATION OF ALUMINIUM HYBRID COMPOSITES IN AUTOMOTIVE INDUSTRYBlaza Stojanovic
Strict requirements that are put on mechanical constructions from the aspect of increase of exploitation periods and reduction of their weights, therefore of their prices as well, implicate developments and applications of new composite materials with matrices of lightweight metals. Composite materials with metal matrices are used for engine cylinders, pistons, disc and drum brakes, Cardan shafts and for other elements in automotive and aviation industry. The most important type of metallic materials is composite materials with matrices of aluminium alloys due to a set of their beneficial properties. Improvement of mechanical, especially tribological properties of hybrid composites were provided by the use of certain reinforce materials such as SiC, Al2O3 and graphite in defined weight or volumetric share. New developed hybrid composites with aluminium matrices have significantly higher resistance to wear, higher specific stiffness and higher resistance to fatigue. By the increase of quantities of produced elements made of hybrid composites, decrease of their prices is induced that even further enlarge their applications. The applications of aluminium hybrid composites are considered from the aspect and with the focus on automotive industry.
Using the scholar data and researcher point of view on composite materials. We illustrate the application of composite material in aerospace industry. Composites are highly efficient to make the parts and structure of aircrafts. We found the characteristics of the composite material make it very suitable material for aerospace industry. Composites like carbon fiber, carbon epoxy, and glass epoxy are very light and high strength which is mostly used in aircraft industries. In addition, our study takes the first step to highlight the uses of composite material to manufacture the different parts of aircraft's.
APPLICATION OF ALUMINIUM HYBRID COMPOSITES IN AUTOMOTIVE INDUSTRYBlaza Stojanovic
Strict requirements that are put on mechanical constructions from the aspect of increase of exploitation periods and reduction of their weights, therefore of their prices as well, implicate developments and applications of new composite materials with matrices of lightweight metals. Composite materials with metal matrices are used for engine cylinders, pistons, disc and drum brakes, Cardan shafts and for other elements in automotive and aviation industry. The most important type of metallic materials is composite materials with matrices of aluminium alloys due to a set of their beneficial properties. Improvement of mechanical, especially tribological properties of hybrid composites were provided by the use of certain reinforce materials such as SiC, Al2O3 and graphite in defined weight or volumetric share. New developed hybrid composites with aluminium matrices have significantly higher resistance to wear, higher specific stiffness and higher resistance to fatigue. By the increase of quantities of produced elements made of hybrid composites, decrease of their prices is induced that even further enlarge their applications. The applications of aluminium hybrid composites are considered from the aspect and with the focus on automotive industry.
We illustrate the application of composite material in aerospace industry. Composites are highly efficient to make the parts and structure of aircrafts. We found the characteristics of the composite material make it very suitable material for aerospace industry. Composites like carbon fiber, carbon epoxy, and glass epoxy are very light and high strength which is mostly used in aircraft industries. In addition, our study takes the first step to highlight the uses of composite material to manufacture the different parts of aircrafts.
Structural Analysis of Ladder Chassis Frame for Jeep Using Ansys IJMER
Automotive chassis frame is an important part of an automobile. The automotive chassis
frame is the structural backbone of any vehicle. The main function of chassis frame is to support the
body, different parts of an automobile and topayload placed upon it.The chassis frame has to withstand
the stresses developed as well as deformation occurs in it and to withstand the shock, twist vibration
and other stresses. Its principle function is to carry the maximum load for all designed operating
condition safelythat should be within a limit. On chassis, frame maximum shear stress and deflection
under maximum load are important criteria for design andanalysis. In these projects, we
havecalculated the von mises stress and shear stress for the chassis frame and the finite element
analysis has been donefor the validation on the chassis frame model of jeep. We have taken certain
material as Mild sheet steel, aluminium alloy and titanium alloy for the rectangular hollow box type to
design chassis frame of jeep.
Software used in this project, CATIA V5-[Product 1] for design purpose and ANSYS 14 is used for
analysis.
Progressive collapse is the result of a localized failure of one or two structural elements that lead to a steady progression of load transfer that exceeds the capacity of other surrounding elements, thus initiating the progression that leads to a total or partial collapse of the structure. The present study is to evaluate the behavior of G+8 reinforced concrete building subjected to potential collapse. The reinforced concrete structure is analyzed by Pushover Analysis using ETABS Software. It shows the maximum storey displacement and a maximum storey drift values of the components are studied. And the potential of the progressive collapse is determined.
Reinforced concrete (RC) has become one of the most important building materials and is widely used in
many types of engineering structures. For the efficient use of RCC it is necessary to know the properties and the
behavior of RCC elements under various constrains. Within the framework of developing advanced design and
analysis methods for modern structures the need for experimental research continues
Finite Element Analysis of Fire Truck Chassis for Steel and Carbon Fiber Mate...IJERA Editor
Chassis is the foremost component of an automobile that acts as the frame to support the vehicle body. Hence the frame ought to be very rigid and robust enough to resist shocks vibrations and stresses acting on a moving vehicle. Steel in its numerous forms is commonly used material for producing chassis and overtime alumimium has acquired its use. However, in this study traditional materials are replaced with ultra light weight carbon fiber materials. High strength and low weight of carbon fibers makes it ideal for manufacturing automotive chassis. This paper depicts the modal and static structural analysis of TATA 407 fire truck chassis frame for steel as well as carbon fibers. From the analyzed results, stress, strain and total deformation values were compared for both the materials. Since it is easy to analyze structural systems by finite element method, the chassis is modified using PRO-E and the Finite Element Analysis is performed on ANSYS workbench.
Autoclave is a closed vessel (Round or Cylindrical) in which processes occur under simultaneous application of high temperature and pressure. Autoclave molding technique is similar to vacuum bag and pressure bag molding method with some modifications. This method employs an autoclave to provide heat and pressure to the composite product during curing.
Synthesis And Characterization of Aluminum –Silicon-Fly Ash Composite By Stir...IRJESJOURNAL
Abstract :- In this work aluminium 7075 as matrix and silicon carbide and fly ash as reinforcements has been used. The %wt of reinforcement are varied to study the difference in aluminium property. Following are the samples are aluminium 7075 as 100%, aluminium 7075 90% + 10% SiC, and aluminium 7075 90% + 10% fly ash. The materials are obtained by stir casting technique. During casting 300 grams of aluminium has been taken as sample 1. 270grams of aluminium has been taken with 30grams of SiC as sample 2. The third sample is the mixture of 270grams of aluminium with 30grams of fly ash. Then the materials are made in the form of cylindrical rod of 30mm diameter and max length of 70mm. The composites are analysed for the mechanical study and the results are obtained based on hardness and the work has been extended to study the micro structure of the specimen by SEM analysis and Chemical Conformation.
We illustrate the application of composite material in aerospace industry. Composites are highly efficient to make the parts and structure of aircrafts. We found the characteristics of the composite material make it very suitable material for aerospace industry. Composites like carbon fiber, carbon epoxy, and glass epoxy are very light and high strength which is mostly used in aircraft industries. In addition, our study takes the first step to highlight the uses of composite material to manufacture the different parts of aircrafts.
Structural Analysis of Ladder Chassis Frame for Jeep Using Ansys IJMER
Automotive chassis frame is an important part of an automobile. The automotive chassis
frame is the structural backbone of any vehicle. The main function of chassis frame is to support the
body, different parts of an automobile and topayload placed upon it.The chassis frame has to withstand
the stresses developed as well as deformation occurs in it and to withstand the shock, twist vibration
and other stresses. Its principle function is to carry the maximum load for all designed operating
condition safelythat should be within a limit. On chassis, frame maximum shear stress and deflection
under maximum load are important criteria for design andanalysis. In these projects, we
havecalculated the von mises stress and shear stress for the chassis frame and the finite element
analysis has been donefor the validation on the chassis frame model of jeep. We have taken certain
material as Mild sheet steel, aluminium alloy and titanium alloy for the rectangular hollow box type to
design chassis frame of jeep.
Software used in this project, CATIA V5-[Product 1] for design purpose and ANSYS 14 is used for
analysis.
Progressive collapse is the result of a localized failure of one or two structural elements that lead to a steady progression of load transfer that exceeds the capacity of other surrounding elements, thus initiating the progression that leads to a total or partial collapse of the structure. The present study is to evaluate the behavior of G+8 reinforced concrete building subjected to potential collapse. The reinforced concrete structure is analyzed by Pushover Analysis using ETABS Software. It shows the maximum storey displacement and a maximum storey drift values of the components are studied. And the potential of the progressive collapse is determined.
Reinforced concrete (RC) has become one of the most important building materials and is widely used in
many types of engineering structures. For the efficient use of RCC it is necessary to know the properties and the
behavior of RCC elements under various constrains. Within the framework of developing advanced design and
analysis methods for modern structures the need for experimental research continues
Finite Element Analysis of Fire Truck Chassis for Steel and Carbon Fiber Mate...IJERA Editor
Chassis is the foremost component of an automobile that acts as the frame to support the vehicle body. Hence the frame ought to be very rigid and robust enough to resist shocks vibrations and stresses acting on a moving vehicle. Steel in its numerous forms is commonly used material for producing chassis and overtime alumimium has acquired its use. However, in this study traditional materials are replaced with ultra light weight carbon fiber materials. High strength and low weight of carbon fibers makes it ideal for manufacturing automotive chassis. This paper depicts the modal and static structural analysis of TATA 407 fire truck chassis frame for steel as well as carbon fibers. From the analyzed results, stress, strain and total deformation values were compared for both the materials. Since it is easy to analyze structural systems by finite element method, the chassis is modified using PRO-E and the Finite Element Analysis is performed on ANSYS workbench.
Autoclave is a closed vessel (Round or Cylindrical) in which processes occur under simultaneous application of high temperature and pressure. Autoclave molding technique is similar to vacuum bag and pressure bag molding method with some modifications. This method employs an autoclave to provide heat and pressure to the composite product during curing.
Synthesis And Characterization of Aluminum –Silicon-Fly Ash Composite By Stir...IRJESJOURNAL
Abstract :- In this work aluminium 7075 as matrix and silicon carbide and fly ash as reinforcements has been used. The %wt of reinforcement are varied to study the difference in aluminium property. Following are the samples are aluminium 7075 as 100%, aluminium 7075 90% + 10% SiC, and aluminium 7075 90% + 10% fly ash. The materials are obtained by stir casting technique. During casting 300 grams of aluminium has been taken as sample 1. 270grams of aluminium has been taken with 30grams of SiC as sample 2. The third sample is the mixture of 270grams of aluminium with 30grams of fly ash. Then the materials are made in the form of cylindrical rod of 30mm diameter and max length of 70mm. The composites are analysed for the mechanical study and the results are obtained based on hardness and the work has been extended to study the micro structure of the specimen by SEM analysis and Chemical Conformation.
Experimental Investigation of Wear Properties of Aluminium LM25 Red Mud Metal...IJSRD
The use of different kind of Metal-matrix composite materials is in constant growing over the years, because they have better physical, mechanical and tribological properties comparing to matrix materials. In automotive industry they are used for pistons, cylinders, engine blocks, brakes and power transfer system elements. Research attempts have been made in the past toreduce the cost of processing of composites, decrease the weight of the composites, and increase the desired performance characteristics. This paper presents the findings of an experimental investigation on the effects of applied load, RPM, Sliding distance and pin temperature in dry sliding wear studies performed on red mud-based aluminum metal matrix composites (MMC). Red mud is an industrial waste during the production of aluminum from bauxite ore. A pin-on-disc apparatus was used to conduct the dry sliding wear test. Taguchi-based L9 orthogonal array has been used to accomplish the objective of the experimental study. Analysis of variance (ANOVA) is employed to find the optimal setting and the effect of each parameter on wear rate.
Studies On Microstructure And Mechanical Properties Of Flyash Reinforced Al20...dbpublications
The aim is to study the mechanical property and Tribological behavior of Al2024/flyash composite with various weight fractions (3%, 6%, 9%) were prepared by squeeze casting method. The average particle size of flyash is 45-50 μm. In addition, Al2024 alloys were cast for comparison purposes. Microstructure, hardness and tensile properties of these composites were evaluated and compared with as-cast alloy and the composites. In addition, tribological properties of these composites were evaluated using a Pin-on-Disc apparatus with different parameters of varying loads of 10N and 50N and(with constant parameters such as time of 10 minutes, sliding velocity of 3 m/s, track diameter of 150mm).The microstructure of the composites shows homogenous distribution of flyash particles in the Al matrix composite. The wear and mechanical properties of composites improve with increasing the weight fraction of flyash. The aim of present study is to evaluate the effect of microstructure, mechanical and tribological properties of aluminium alloy Al2024/flyash metal matrix composites
Evaluation Of Factors Affecting Sliding Wear Behaviour Of Al-Flyash Metal Mat...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
A Study on Mechanical Properties of Aluminium Alloy (LM6) Reinforced with SiC...IOSR Journals
This work deals with fabricating or producing aluminium based metal matrix composite and then
studying its microstructure and mechanical properties such as tensile strength, impact strength and wear
behavior of produced test specimen. In the present study a modest attempt has been made to develop aluminium
based MMCs with reinforcing material, with an objective to develop a conventional low cast method of
producing MMCs and to obtain homogeneous dispersion of reinforced material. To achieve this objective stir
casting technique has been adopted. Aluminium Alloy (LM6) and SiC, Fly Ash has been chosen as matrix and
reinforcing material respectively. Experiment has been conducted by varying weight fraction of Fly Ash ( 5%
and 15%) while keeping SiC constant(5%). The result shown that the increase in addition of Fly Ash increases
the Tensile Strength, Impact Strength, Wear Resistance of the specimen and decreases the percentage of
Elongation
Computer Science
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Adaptive, autonomic and context-aware computing
Advance Computing technology and their application
Advanced Computing Architectures and New Programming Models
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Changing Access to Patient Information
Channel capacity modelling and analysis
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Computer and microprocessor-based control
Computer Architecture and Embedded Systems
Computer Business
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Computer-based information systems in health care
Computing Ethics
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Context-awareness and middleware
Creativity in Internet management and retailing
Cross-layer design and Physical layer based issue
Cryptography
Data Base Management
Data fusion
Data Mining
Data retrieval
Data Storage Management
Decision analysis methods
Decision making
Digital Economy and Digital Divide
Digital signal processing theory
Distributed Sensor Networks
Drives automation
Drug Design,
Drug Development
DSP implementation
E-Business
E-Commerce
E-Government
Electronic transceiver device for Retail Marketing Industries
Electronics Engineering,
Embeded Computer System
Emerging advances in business and its applications
Emerging signal processing areas
Enabling technologies for pervasive systems
Energy-efficient and green pervasive computing
Environmental Engineering,
Estimation and identification techniques
Evaluation techniques for middleware solutions
Event-based, publish/subscribe, and message-oriented middleware
Evolutionary computing and intelligent systems
Expert approaches
Facilities planning and management
Flexible manufacturing systems
Formal methods and tools for designing
Fuzzy algorithms
Fuzzy logics
GPS and location-based app
Computer Science
Active and Programmable Networks
Active safety systems
Ad Hoc & Sensor Network
Ad hoc networks for pervasive communications
Adaptive, autonomic and context-aware computing
Advance Computing technology and their application
Advanced Computing Architectures and New Programming Models
Advanced control and measurement
Aeronautical Engineering,
Agent-based middleware
Alert applications
Automotive, marine and aero-space control and all other control applications
Autonomic and self-managing middleware
Autonomous vehicle
Biochemistry
Bioinformatics
BioTechnology(Chemistry, Mathematics, Statistics, Geology)
Broadband and intelligent networks
Broadband wireless technologies
CAD/CAM/CAT/CIM
Call admission and flow/congestion control
Capacity planning and dimensioning
Changing Access to Patient Information
Channel capacity modelling and analysis
Civil Engineering,
Cloud Computing and Applications
Collaborative applications
Communication application
Communication architectures for pervasive computing
Communication systems
Computational intelligence
Computer and microprocessor-based control
Computer Architecture and Embedded Systems
Computer Business
Computer Sciences and Applications
Computer Vision
Computer-based information systems in health care
Computing Ethics
Computing Practices & Applications
Congestion and/or Flow Control
Content Distribution
Context-awareness and middleware
Creativity in Internet management and retailing
Cross-layer design and Physical layer based issue
Cryptography
Data Base Management
Data fusion
Data Mining
Data retrieval
Data Storage Management
Decision analysis methods
Decision making
Digital Economy and Digital Divide
Digital signal processing theory
Distributed Sensor Networks
Drives automation
Drug Design,
Drug Development
DSP implementation
E-Business
E-Commerce
E-Government
Electronic transceiver device for Retail Marketing Industries
Electronics Engineering,
Embeded Computer System
Emerging advances in business and its applications
Emerging signal processing areas
Enabling technologies for pervasive systems
Energy-efficient and green pervasive computing
Environmental Engineering,
Estimation and identification techniques
Evaluation techniques for middleware solutions
Event-based, publish/subscribe, and message-oriented middleware
Evolutionary computing and intelligent systems
Expert approaches
Facilities planning and management
Flexible manufacturing systems
Formal methods and tools for designing
Fuzzy algorithms
Fuzzy logics
GPS and location-based app
EFFECT OF GRAPHITE ON MECHANICAL AND MACHINING PROPERTIES OF Al-BRONZE PREPAR...IAEME Publication
Aluminum bronzes are the highest strength standard copper based alloys. For their combination of high strength, excellent corrosion and wear resistance these alloys have a wide
acceptance in engineering applications, so studying their improvement still important. In the present study, a base aluminum bronze alloy with a chemical composition of (Cu – 11%Al) is prepared basing on powder metallurgy technique with a determined suitable compacting pressure of 400MPa,
sintering for 1 hour in 920°C in a vacuum furnace (10-4 tor), and then quenching from 950°C in cold water and tempered at 4500C for 2hrs.
2. Some Studies on Aluminium – Fly Ash Composites Fabricated by Two Step Stir Casting Method 205
particles which are extracted from residues generated in the combustion of coal were chosen as
reinforcement material. India produces about 110 million tons of fly ash per year from burning about
250 million tons of coal for electric power generation. Apart from energy and cost savings, green house
gases that are generated during the production of Al may be significantly reduced by decreasing the
production of Al by fly ash substitution. Among various processing techniques, stir casting appears to
be most promising route for production of aluminium matrix composites because of simplicity and
ability to manufacture composites on an industrial scale economically. In any production process,
superior quality of the product can be achieved only when the process is run with the optimum
parameters. Mechanical properties of composites are affected by the size and shape of the matrix and
reinforcement materials, weight fraction of the reinforcement as well as reaction at the interface.
Interfacial strength between the matrix and reinforcement plays a significant role in determining the
properties of MMCs. These aspects have been discussed by many researchers.
Fly ash particles were incorporated into the molten Al they were observed to be floating on the
molten Al surface due to the high surface tension which leads poor wettability.Since the gas layers at
the surfaces of the particles can cause the buoyant migration, mechanical stirring can be done in a semi
solid state rather than in the completely liquid state in order to break away the gas layers thereby
reducing surface tension.Wettability can be improved by increasing the surface energies of the solids,
decreasing the surface tension of the liquid matrix alloy and decreasing the solid/liquid interfacial
energy at the reinforcement matrix interface. Magnesium which acts as a powerful surfactant as well as
a reactive element, in the aluminium alloy matrix seems to fulfill all the above three requirements.
Important role played by the magnesium during the composite synthesis is the scavenging of the
oxygen from the dispersoid surface, thus thinning the gas layer and improving wetting action with the
surface of the dispersoids.As concluded from previous research studies the strengthening of aluminium
alloys with a dispersion of fine particulates strongly increases their potential in tribological and
structural applications.
Rohatgi [5] reported that with the increase in volume percentages of fly ash, hardness value
increases in Al–fly ash composites. He also reported that the tensile strength and elastic modulus of Al
composites increases with increase in volume percentage (3–10%) of fly ash. Aghajanian and co
researchers [6] have studied the Al2O3 particle reinforced Al MMCs and reported improvement in
elastic modulus, tensile strength, compressive strength and fracture properties with an increase in the
reinforcement content. Sarkar, Sen and Mishra [10] have studied Al– fly ash composite produced by
impeller mixing and concluded that up to 17 wt% fly ash could be reinforced by liquid metallurgy
route and also the addition of magnesium increases the wettability which leads mechanical properties
such as hardness, tensile strength and the wear resistance. Guo and Rohatgi [12] observed that a slight
decrease in density and strength of Al composites with increasing weight per cent of fly ash while
hardness increased slightly up to 10 wt % fly ash, beyond 10 wt % a decrease was reported.
Radhakrishna and Ramachandra [21] have investigated the effect of fly ash on sliding wear,
slurry erosive wear and corrosive behavior of aluminium matrix composites produced by stir casting
method and concluded that Al (12 wt% Si) -15 wt% of fly ash particulate composite improved the
abrasive wear resistance however the corrosion resistance decreased as fly ash content
increases.Sudarshan and Surappa [22, 23] have synthesized A356 Al–fly ash particle composites and
studied on dry sliding wear .They concluded that the addition of 6% of fly ash particles into A356 Al
alloy showed lower wear rates at low loads (10 and 20 N) while 12% of fly ash reinforced composites
showed lower wear rates compared to the unreinforced alloy in the load range 20–80 N.Corrosion wear
of composites is a critical design criterion. Aylor and co researchers [24] stated that pitting corrosion
on Al-SiC composites was observed predominantly at the interface between the Al and SiC.
Feng and co researchers [25] analyzed the pitting corrosion behaviour of Al-SiC 2024
composites and attributed the corrosion of the composites to pit formation at the Al-SiC interface.
Rohatgi, Weiss, and Nikhil Gupta [11] have suggested that Al- fly composites could be used for
automotive and other applications due to their better mechanical properties.Al-fly ash composites offer
many potential applications particularly for internal combustion engine pistons and brake rotors. Thus,
3. 206
P. Shanmughasundaram, R. Subramanian and G. Prabhu
much research has been carried out on particulate metal matrix composites for tribological applications
due to the advantages of MMCs such as excellent wear resistance, high load carrying capacity and light
weight. Though aluminium alloys are restricted in their tribological behaviour, it has been observed by
the various researchers that increasing the ceramic reinforcement particles content could improve the
wear resistance.
Hence application of aluminium matrix composites is gradually increasing in the automotive
industries in making pistons, cylinder heads and connecting rods where the tribological properties of
the material are very important.
Wear resistance of particulate composites significantly depends on the grit size, hardness,
weight fraction and distribution of reinforcement particles, properties of matrix material, interfacial
bonding between the matrix and reinforcement particles and experimental conditions such as hardness
of the counter surface, applied load, sliding distance and sliding speed. The present work aims to
investigate microstructure, mechanical, wear and corrosion behaviour of fly ash particle reinforced
commercial aluminium composites fabricated by a two step stir casting method.
2. Experimental Work
In this study, 99.5 % pure aluminium ingot was used as the matrix material and fly ash particles with
average size of (50-100μm) was used as the reinforcement and its chemical composition is shown in
the table 1.
Table 1:
Compound
%
Chemical composition of fly ash
SiO2
54.27
Al2O3
34.73
Fe2O3
6.1
CaO
2.4
MgO
2.1
In this research, Al - fly ash composites were produced varying percentage of fly ash (ie 5, 10,
15, 20, 25 wt %) by two step stir casting method. Stir casting setup is shown in Fig.1
Figure 1: Stir casting setup
The fly ash particles were preheated to 600˙C for 2 hours in a separate muffle furnace to
remove the moisture content. Aluminium was charged in to the graphite crucible, and the furnace
temperature was raised up to liquidus temperature 670˙C in order to melt the Al scraps completely and
further the melt temperature was dropped to 620˙C to obtain a semi solid state.1.5 wt% Magnesium
4. Some Studies on Aluminium – Fly Ash Composites Fabricated by Two Step Stir Casting Method 207
and then preheated fly-ash particles were added into the crucible. Mg was added to the melt to promote
the wetting action between Al matrix and fly ash reinforcement particles.
The molten Al composite slurry was stirred with a stirrer at a speed of 300 rpm after obtaining
the semi- solid state for 10 minutes. Then the slurry was reheated to liquidus temperature of Al and the
second step stirring was started in a liquid state for 5 minutes until the slurry was poured in a mould to
solidify. The impeller was placed 1/3rd height from the bottom of the crucible. Since high torque was
needed in mixing of the composite slurry in semi solid state, a variable torque - speed controlled
mechanical stirrer was employed. Argon gas was blown at the rate of 2CC/min in to the furnace during
the process to prevent oxidation of aluminium and magnesium. The melting was done in an electrical
resistive furnace (2kW-1Kg capacity). Temperatures were measured with a thermocouple (+/- 3 K
accuracy).
3. Microstructure Analysis
Optic microscope and Scanning Electronic Microscope (SEM) were employed to analyze the
microstructure and also the wear surface profile to decide the wear mechanism of the material. Samples
were mechanically polished using standard metallographic practices and etched with Keller’s regent
prior to micro structural examination.
4. Mechanical Properties
4.1. Density
Density of the composite specimens was obtained experimentally by the Archimedes principle.
Theoretical density was calculated applying the rule of mixtures according to the weight fraction of
reinforcement.
4.2. Hardness
Hardness test was performed on Al and composite specimens. The hardness values of the specimen
were measured using Brinell hardness testing system with 10mm diameter at a load of 500 kg. The
loading time was 30 seconds. Three readings were taken on each specimen to eliminate possibility of
segregation and mean value was taken as the hardness of the composite.
4.3. Tensile and Compressive strength
Tensile and compressive strength tests were carried out on Al specimens and composites using a
computerized UTM testing machine as per the ASTM E-8 standards. Three samples were tested for
each composition and mean value was taken as the tensile and compressive strengths.
5. Dry Sliding Wear
A cylindrical pin of size 10mm diameter and 15mm length Al and composite specimens were prepared
and loaded in a computer interfaced pin- on -disc wear testing rig as shown in Fig.2. Before testing, the
surface of the specimens was polished by using 1000 grit paper. The rotating disc was made of EN 32
steel of diameter 75 mm and hardness of 65HRC. Wear tests were carried out at room temperature for
20 minutes.
The test parameters used were as follows:
Normal loads: 5, 15 N.
Sliding speeds: 0.5, 1.0 m/s.
5. 208
P. Shanmughasundaram, R. Subramanian and G. Prabhu
Figure.2: Pin- on -disc wear testing rig
6. Corrosion Studies
Corrosion is essentially an electrochemical process in which an oxidation reaction occurs at the anode
and a reduction reaction occurs at the cathode.
The basic methodology is to measure the current flow in the electrolyte medium, which is
proportional to corrosion rate with reference to potential applied. Corrosion tests were conducted for
both unreinforced Al and composite specimens with varying weight % of fly ash content (5%, 10%,
15%, 20% and 25%).
Al and Al – fly ash composite specimens were subjected to corrosion test in 4% NaCl
electrolyte solution at a pH of 3 using a standard Gill AC series-903 potentiostat.A typical equipment
consists of Applied Corrosion Monitoring (ACM) Gill AC instrument and electrochemical cell which
consists of NaCl electrolyte, a reference calomel electrode, a platinum auxiliary electrode and a
working electrode of the specimen.
The specimens were machined to 20 mm dia and 20 mm length and were ground using 600grit
emery paper, rinsed in distilled water and methanol to remove surface contaminants, and finally dried.
7. Results and Discussion
Al - fly ash composites were successfully produced by a two step stirring method which ensures
homogenous particle distribution
7.1. Mechanical Behaviour
The graph of theoretical and experimental densities of the composites according to the fly ash content
is shown in Fig.3.
Generally the fly ash particles are having low density in nature. In the present study precipitator
type fly ash was used with a density less than 2.2 g/cm3.The density of the composite specimens was
determined experimentally by the Archimedes principle. The small pieces cut from the specimens were
weighed first in air and then water and density values were calculated using the following expression.
weight in air
water
(weight in air - weight in water)
Theoretical density values were determined using the rule of mixtures relation. The
experimental density values of the Al-fly ash composites decreased linearly with addition of fly ash
particles. The decrease in density of composites can be attributed to lower density of fly ash particles
than that of the unreinforced Al.It was also noted that the theoretical values closely matches with the
6. Some Studies on Aluminium – Fly Ash Composites Fabricated by Two Step Stir Casting Method 209
experimental values when the fly ash content is less than 20 wt%. It indicates that the interface
between matrix and reinforcement was almost perfectly bonded the prepared castings are dense and
sound. However when the fly ash content increases beyond 20 wt%, there is a mismatch between the
theoretical and measured density values due to increased porosity and particle clustering.
Figure 3: Density of the Al and Al- fly ash composites at various Wt% of fly ash particles
Figure 4: Hardness of the Composites at various Wt% of fly ash particles
Figure 5: Tensile strength of the Composites at various Wt% of fly ash particles
7. 210
P. Shanmughasundaram, R. Subramanian and G. Prabhu
Figure 6: Compressive strength of the Composites at various Wt% of fly ash particles
Table 2:
Mechanical properties of Al and Al -fly ash Composites
Fly ash (wt)
Density (g/cm3)
Hardness (BHN)
0%
5%
10%
15%
20%
25%
2.700
2.661
2.633
2.600
2.569
2.523
19
25
36
47
51
45
Tensile Strength
(MPa)
77
89
102
118
113
104
Compressive
Strength (MPa)
337
418
501
568
622
497
The results of the hardness test (Table.2) shows the values of hardness with the weight fraction
of fly ash. As seen from Fig.4, an increasing trend of hardness was observed with increase in weight
fraction of fly ash particles up to 20%.Beyond this hardness trend started decreasing. Incorporation of
fly ash particles up to 20wt% significantly improves the hardness of the Al matrix. The presence of
hard fly ash particles in the composites enhances the dislocation density which resists the deformation
when it is subjected to strain. When the fly ash content increased from 5% to 20 wt %, hardness
increases from 25 BHN to 51 BHN.It can be explained by the fact that the fly ash particles possess
higher hardness than the aluminium.
Tensile strength tests were performed and the results of the test are shown in Fig.5. Results
show that the tensile strength of composites is higher than that obtained for the unreinforced Al.
Tensile strength of unreinforced Al is 77 MPa and this value increases to a maximum of 113MPa for
Al- 15 wt% fly ash composite which is about 35% improvement over that of the unreinforced Al
matrix. When the fly ash content increased from 20% to 25%, tensile strength decreases from 113 MPa
to 104 MPa.It was observed that in probably due to clustering of the reinforcement particles the
composites containing more than 15wt% of fly ash particles the rate of increase in tensile strength
decreases significantly.
Results of the compression tests are shown in Fig.6. Results revealed that the incorporation of
fly ash particles significantly improves the compressive strength of Al matrix. However the
compressive strength of the composites begins to drop when the fly ash content increased from 20 % to
25 wt%. Beyond 20 wt%, the fly ash particles interact with each other due to particles clustering which
deteriorates the properties. It may be noted that the composites subjected to compressive stress, Al
matrix around fly ash particles flows away in the direction perpendicular to the applied load which
reduces load transfer ability of the matrix.
Thus, it can be concluded that the mechanical properties such as density, hardness, tensile and
compressive strengths of the composites increases by increasing fly ash content. Addition of
magnesium improves the wettability between the fly ash particles and enhances the mechanical
8. Some Studies on Aluminium – Fly Ash Composites Fabricated by Two Step Stir Casting Method 211
properties of the composites by solid solution strengthening. In addition, mechanical stirring in the
semi solid state enhances the uniform distribution between them.
It was also observed from the Table.2 that the trend of declining mechanical properties such as
hardness, tensile and compressive strengths of the composites with increasing fly ash content beyond
15 – 20 wt%.
Agglomeration of fly ash particles could reduce the interfacial bonding between Al and fly ash
particles.
The diffusion of Mg at the Al- fly ash interface could also result in Mg depletion from the
matrix, accounting for the reduction of the Mg2Si particle size which leads to a decrease in solid
solution strengthening. Hence results in the decline in the mechanical properties of the composites.
Figure7: Few tested specimens (A: Wear; B: Tensile strength; C: Hardness)
7.2. Sliding Wear Behaviour
Average wear loss of the composites were examined as a function of fly ash particle content at various
load and sliding speed conditions against carbon steel as illustrated graphically in Figures. 8 and 9.Few
tested wear pin specimens are shown in Fig.7.
Wear, the progressive loss of material from the sliding surfaces of the elements of a tribosystem can be determined in terms of weight loss. Material properties of the sliding elements, applied
load and sliding speed determine the wear rate. Wear resistance of the Al- fly ash reinforced
composites is increased compared to the unreinforced Al at all sliding speed and load conditions.
Drastic decrease in wear loss was observed with the incorporation of reinforcement content.
Figure 8: Wear loss of Al specimen and Al –fly ash composites as a function of sliding speeds 0.5 m/s and
1m/s at constant load 5N
9. 212
P. Shanmughasundaram, R. Subramanian and G. Prabhu
Figure.9 : Wear loss of Al and Al –fly ash composites specimen as a function of of sliding speeds 0.5 m/s and
1m/s at constant load 15N
The decreasing tendency in wear rate of the Al- fly ash composites was observed from the Fig.8
when the sliding speed increases from 0.5 m/s to 1m/s at low load (5N) and lower concentration of fly
ash (<20 wt %). As the sliding speed increases, the surface of the counter face reacts to form ferrous
oxide (Fe3O4) along with aluminum oxide (Al2O3) and a Mechanical Mixing Layer – MML between
the composite pin and the counter face was formed. It is obvious that the work hardening of the
aluminium occurs during the sliding action and also formation of iron oxide film (Fe3O4) on the surface
of the pin which enhances the wear resistance.
Fig.9 indicates that the wear rate of the Al increased as the sliding speed increases and the same
trend of was observed in Al – fly ash composites at higher load 15N
At higher speed (1m/s) and load (15 N) conditions, the thermal softening effect of the Al lowers
the interfacial bond between the Al and fly ash materials and also the protective oxide layer smashed
out during the sliding action resulting in higher wear loss . By superimposing the Fig.8 and Fig.9, it can
be observed that the wear rate of the Al and Al- fly ash composites increases as the load increases from
5 N to 15 N. The obtained results are inline with the other researchers [23]. Further, from the Figures 8
and 9, trend in wear resistance can be found to be increasing with increase of fly ash content in the
composites. This increase in wear resistance of the composite is due to the reason the reinforcement
material is much harder than that of the matrix material.
Wear grooves and scratches along the sliding direction were smaller due to the presence of fly
ash particulates. This shows that the presence of fly ash in the matrix improves resistance to wear.
Applied load affects the wear behaviour of composites and is the most dominating factor in controlling
the wear rate.
Since the Al matrix is much softer than the carbon steel disc, the steel penetrates to larger depth
into the surface and cuts severely, causing plastic deformation of the surface resulting in a great
amount of material loss. The worn surface of the Al – wt 5% fly ash shows little plastic deformation as
shown in Fig.10.
Worn surface of the Al composite with 25 wt% fly ash was characterized by many pull-out and
exposures of the fly ash particles and more wear debris was observed which indicated the poor
interfacial strength between the Al matrix and fly ash particles. Large grooves and scratches appeared
on the worn surfaces as shown in Fig.11 and there was no indication of plastic deformation.
10. Some Studies on Aluminium – Fly Ash Composites Fabricated by Two Step Stir Casting Method 213
Figure 10: The worn surface of the Al – wt 5%fly ash with a normal load of 5N with 1m/s Sliding velocity
Figure 11: The worn surface of the Al – wt 25%fly ash composite with a normal load of 15N and 0.5m/s
Sliding velocity.
The lowest wear loss was obtained for composite with 20wt% fly ash compared to composites
reinforced with 5 wt %, 10 wt % and 15 wt % fly ash.Al-20wt% fly ash composite demonstrated wear
resistance approximately 7 times higher than that of unreinforced Al at 1 m/s sliding speed and 5N load
conditions. This is because incorporation of fly ash particles have increased the hardness of Al
considerably (Table 2) .This increase in wear resistance can also be attributed to a better interfacial
bonding between Al and fly ash particles and thus helps in preventing the damages caused due to
sliding action. Incorporation of 20wt% fly ash particles to the Al matrix was very effective in reducing
its wear loss. This is because of the strong interfacial bond which plays a vital role in transferring loads
from the Al matrix to the hard fly ash particles. As the fly ash content increases beyond 20 wt% the
wear loss increased with increasing the load. This may be due to clustering of fly ash particles and poor
interfacial bonding between Al matrix and fly ash particles.
When the two surfaces are in sliding contact, wear mechanisms such as surface abrasion,
oxidation, delamination and adhesion may happen either separately or in combination. The surface
morphologies of the worn composites indicate the following.
1. 1.At low loads, fly ash particles support the load and prevents Al matrix have direct
contact with the counter part thus helps in preventing the damages caused due to sliding
action. Abrasion wear mechanism becomes dominant under this condition.
2. 2. Higher applied load results in stresses which exceed fracture stress of fly ash particles,
these particles lose their capacity to sustain the load. In addition the hard fly ash particles
create scars on the surface of the steel counter face which in turn causes higher wear rate
of the composite. The worn out particles also act as third body abrasives, initiate friction
and could penetrate the opposing surfaces in a contact zone which lead micro ploughing
action at the interface.
3. 3. At lower sliding speeds abrasion is dominant, while at higher sliding speeds
delamination and adhesion dominate.
11. 214
P. Shanmughasundaram, R. Subramanian and G. Prabhu
It follows from the above observations that the main wear mechanism at higher loads and high
sliding speeds is delaminating wear causing excessive fracture of the reinforcement and the matrix,
resulting in deterioration of the wear resistance of the composites.
When the composite is subjected to the higher applied load with higher sliding speed, cracks on
the surface propagates in the subsurface which brings loss of material from the worn surface in the
form of flakes or thin sheets. Considerable amount of Iron debris is also transferred from the counter
face to the composite pins.
Delamination was observed to be more extensive under the higher load of 20N.
7.3. Corrosion Wear Behaviour
The corrosion wear of composites is influenced by several factors such as porosity, high dislocation
densities at the matrix-reinforcement interfaces, the presence of intermetallic compounds and
interfacial reaction products, and the electrical conductivity of the reinforcing phases.
Corrosion wear was evaluated in terms of mm/year for the fabricated Al and Al – fly ash
composites with varying proportion of fly ash content using Potentiostat corrosion testing rig which is
shown in Fig.12.
Figure 12: Potentiostat corrosion testing rig
Electro chemical polarization reactivation curves (EPR) were obtained with the help of ACM
software.
Corrosion current and corrosion rate were determined using the following expression specified
by ASTM G1-90.
Corrosion rate in mm/year = [Icorr ×Metal factor]/1000
where,
I corr
(ba bc)
, A / m2
2.3 Rp (ba bc)
ba is anodic Tafel slope in Volts
bc is the cathodic Tafel slope in Volts
Rp is the polarization resistance in W/m2
Metal factor t K /
Where, t (seconds in year), is the specimen density in g/ cm3 ,K is the electrochemical
equivalent in g/coulombs,
K
weight % of element × atomic weight of element
96487 × Valency of element
It was observed from the EPR curve that Al-15wt% fly ash composite indicates a decrease of
the corrosion potential and an increase of the corrosion current density than that of EPR curve of Al. It
12. Some Studies on Aluminium – Fly Ash Composites Fabricated by Two Step Stir Casting Method 215
may be noted that the high corrosion density of Al- fly ash composites increases the rate of Al
dissolution due to pH variations at the interface. Results show that the corrosion and pitting potentials
of Al were superior to Al- fly ash composites.
Figure.13: Corrosion rate of Al and Al- fly ash composites
Fig.13 shows that Al and Al- 25 wt% fly ash composite had the lowest and highest corrosion
rate, respectively. The corrosion rate of Al- 25wt%fly ash composite is about 10 times higher than that
of the Al.
According to the general qualitative classification of corrosion rates, moderate corrosion
behaviour is seen when the fly ash content is less than 15 wt%.
Figure 14: SEM micrograph of Al specimen immersed in 3.5wt % NaCl solution
Figure 15: SEM micrograph of Al-15wt. %fly ash composite specimen immersed in 3.5wt % NaCl solution
13. 216
P. Shanmughasundaram, R. Subramanian and G. Prabhu
SEM micrographs of Al and Al- fly ash specimens are shown in Figures 14 and 15 respectively.
SEM studies revealed that more pits are formed on Al-fly ash composite than on Al. The micrograph
(Fig.15) reveals the presence of cracks and pits which are indicative of localized corrosion.
Incorporation of fly ash to the Al matrix develops discontinuities in the protective oxide layer which
leads to pitting corrosion.
Incorporation of fly ash in the Al matrix releases Fe- rich intermetallic phases such as Al3Fe /
Al6Fe which behaves as cathode. The occurrence of intermetallic phase at the interface provide a
platform for the electron exchange needed for oxygen reduction and increases the anodic reaction at a
higher rate in the composites as compared to an aluminium.Hence, the formation of galvanic couples
between the intermetallics and the Al matrix causes dissolution of Al matrix and finally the detachment
of Al particles lead formation of pits. When the fly ash content increases beyond 10 wt%, corrosion
resistance of the composites is drastically increased .This can be attributed to the formation of more
intermetallic clusters, porosities and voids at the interface.
8. Conclusions
Al –fly ash composites were successfully fabricated by two step stir casting process with homogenous
distribution of fly ash particles in the Al matrix. Wetting of fly ash particles with the Al matrix was
further improved by the addition of 1.5 wt%Mg.
Based on the experimental observations the following conclusions have been drawn.
1. The density of the composites decreased with increasing fly ash reinforcement content.
Hence Al- fly ash composites can be used in applications where weight reductions are
desirable.
2. Hardness, tensile strength and compressive strength were determined for the test
materials. Increasing fly ash content resulted in increase in the tensile strength of the Al.
However, the tensile strength begins to drop when the fly ash content exceeds 15wt% due
to the decrease in solid solution strengthening and particle clustering.
Hardness and compressive strength of composites were found to increase with increased
fly ash content. Above 20 wt% of fly ash, both hardness and compressive strength of
composites begins to decrease.
3. Wear resistance of the commercial Al was considerably enhanced by the addition of fly
ash particles and the wear resistance of the composites was much superior to the
unreinforced aluminium over the entire load range tested under dry sliding conditions.
This may be due to the favorable effect of the fly ash particles which is a dominating
factor affecting the wear resistance. However the addition of only 20wt% fly ash particle
to the Al was very effective to reduce its wear loss.
4. It was observed that the high proportion of fly ash reinforcement shows the poor
resistance to corrosion.
Moderate corrosion resistance is seen when the fly ash content is about 15 wt%
From the results it can be concluded that the Al-fly ash composites could be considered as an
excellent material in sectors where light weight, enhanced mechanical properties and wear resistance
are prime consideration especially in automobile applications.
References
[1]
[2]
Kobashi, M. and T., Choh, 1993. “Wettability and the Reaction for SiC Particle/Al Alloy
System”.Journal of Materials Science, Vol. 28.
Ahlatci, H., M.S., Karakas, E., Candan and H., Cimenoglu, 2003. “Effect of Magnesium
Addition on Wear Behaviour of Al-70 Vol.-% Al2O3p Composites”, Materials Science &
Technology, Vol. 19.
14. Some Studies on Aluminium – Fly Ash Composites Fabricated by Two Step Stir Casting Method 217
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]
[22]
[23]
Liu, Y.L., S.B., Kang and H.W., Kim, 1999. “Complex Microstructures in As-Cast Al-Mg-Si
Alloy”, Materials Letters, Vol. 41.
Rohatgi, P.K., J.K., Kim, R.Q., Guo, D.P., Robertson and M., Gajdardziska-Josifovska, 2002.
“Age Hardening Characteristics of Aluminium Alloy – Hollow Fly Ash Composites”,
Metallurgical & Materials Transaction A, Vol. 33A.
Rohatgi, P. K. and R.Q., Guo, 1997. “Low Cost Cast Aluminium – Fly Ash Composites for
Ultra light Automotive Application”, TMS Annual Meeting, Automotive Alloys.
Aghajanian, M. K., R.A., Langensiepen, M.A., Rocazella, J.T., Leighton, C.A., Andersson and
Mater, 1993. “J. Sci. 28”, 6683–6690.
Rohatgi, P.K., R.Q., Guo, H., Iksan, E.J., Borchelt and R., Asthana, 1998. “Pressure Infiltration
Technique for Synthesis of Aluminium-Fly Ash Particulate Composite”, Metallurgical &
Materials Transaction A, Vol. A244.
Guo, R. Q. and P.K., Rohatgi, 1998. “Chemical Reactions Between Aluminium and Fly Ash
During Synthesis and Reheating of Aluminium-Fly Ash Composite”, Metallurgical &
Materials Transaction B, Vol. 29B.
Lloyd, D. J, 1994. “Particle Reinforced Aluminium and Magnesium Matrix Composites”,
International Materials Reviews, Vol. 39.
Sarkar, S., S., Sen and S.C., Mishra, 2008. “Aluminium – fly ash composite produced by
impeller mixing”, Journal of reinforced plastics and composites.
Rohatgi, P. K., D., Weiss and Gupta Nikhil. 2006. “Applications of fly ash in synthesizing lowcost MMCs for automotive and other applications”, JOM.
Guo, R. Q., and P.K., Rohatgi, 1997. “Preparation of Aluminium-Fly Ash Particulate
Composite By Powder Metallurgy Technique”, Journal Of Material Science, pp.3971- 3974.
Guo, R. Q., D., Venugopalan and P.K., Rohatgi, 1998. “Differential Thermal Analysis to
Establish the Stability of Aluminium-Fly Ash Composites during Synthesis and Reheating”,
Metallurgical & Materials Transaction A, Vol. A241.
Guo, R. Q., P.K., Rohatgi and D., Nath, 1996. “Compacting Characteristics of Aluminium-Fly
Ash Powder Mixtures”, Journal of Materials Science, Vol. 31.
Rohatgi, P. K., R., Guo, B.N., Keshavaram and D.M., Golden, 1995. “Cast Aluminium, Fly
Ash Composites for Engineering Applications”, Transactions of the American Foundrymen’s
Society, Vol. 99.
Kolukisa, S., A., Topuz and A., Sagin, 2003. “The Production and Properties of Fly Ash
Containing Aluminium Matrix Composite Materials”, Practical Metallography, Vol. 40.
Zhang, X. F., D.J., Wang and G., Xie, 2002. “Manufacturing of Aluminium/Fly Ash
Composites with Liquid Reactive Sintering Technology”, Acta Metallurgica Sinica, Vol. 15.
Matsunaga, T., J.K., Kim, S., Hardcastle and P.K., Rohatgi, 2002. “Crystallinity and selected
properties of fly ash particles”, Materials Science and Engineering A325, Coal combustion
product (CCP) production and use survey, American Coal Ash Association.
Rohatgi, P. K., R.Q., Guo, H., Iksan, E.J., Borchelt and R., Asthana, 1998. Mater. Sci. Eng. A,
244, 22-30.
Rohatgi, P. K., R., Guo, B.N., Keshavara. and D.M., Golden, 1995. Trans. Am. Foundrymen’s
Soc. 103, 575-579.
Radhakrishna, K., and M., Ramachandra, 2007. “Effect of reinforcement of fly ash on sliding
wear, slurry erosive wear and corrosive behavior of aluminium matrix composite”, Wear 262,
pp.1450–1462.
Sudarshan and M.K., Surappa, 2008. “Synthesis of fly ash particle reinforced A356 Al
composites and their characterization”, Materials Science and Engineering A 480, pp.117–124.
Sudarshan and M.K., Surappa, 2008. “Dry sliding wear of fly ash particle reinforced A356 Al
composites”, Wear 265, pp.349–360.
15. 218
P. Shanmughasundaram, R. Subramanian and G. Prabhu
[24]
Aylor, D.M., and P.J., Moran .1985. “Effect of Reinforcement on the Pitting Behaviour of
Aluminium-Base Metal Matrix Composites”, Journal of the Electrochemical Society, Vol. 321,
No. 6, pp. 1277-1281.
Feng ,Z., C., Lin, J., Lin and J., Luo J.1998. “Pitting Behaviour of SiCp/2024 Al Metal Matrix
Composites”, Journal of Materials Science, Vol. 33, pp. 5637-5642.
Ferhat Gul and Mehmet Acilar, 2004. “Effect of the reinforcement volume fraction on the dry
sliding Wear behaviour of Al–10Si/SiCp composites produced by vacuum infiltration
technique”. composites Science and Technology 64, 1959–1970.
[25]
[26]