This document discusses friction stir processing (FSP), a technique for modifying the microstructure of metals near the surface. FSP uses a rotating tool to generate heat and plasticize the metal. As the tool traverses the material, it leaves behind a fine-grained microstructure. The document outlines the working principle of FSP and its applications, including fabricating surface composites, refining cast alloys, and producing superplasticity. FSP effectively improves mechanical properties like strength and ductility compared to the as-cast condition.
This content include Friction stir additive manufacturing,friction stir welding , additive manufacturing , need , steps, working principle, result, deffect, process parametre
This content include Friction stir additive manufacturing,friction stir welding , additive manufacturing , need , steps, working principle, result, deffect, process parametre
RTM is a low-pressure molding process, where a mixed resin and catalyst are injected into a closed mold containing a fiber pack or preform . when the resin has cured the mold can be opened and finished component removed.
LASER BEAM MACHINING - NON TRADITIONAL MACHININGSajal Tiwari
Laser Beam Machining or more broadly laser material processing deals with machining and material processing like heat treatment, allowing, cladding, sheet metal bending etc. Such processing is carried out utilizing the energy of coherent photons or laser beam, which is mostly converted into thermal energy upon interaction with most of the materials. Nowadays, the laser is also finding application in regenerative machining or rapid prototyping as in processes like stereolithography, selective laser sintering etc. Laser stands for light amplification by stimulated emission of radiation. The underline working principle of a laser was first put forward by Albert Einstein in
1917 through the first industrial laser for experimentation was developed around the 1960s. The laser beam can very easily be focused using optical lenses as their wavelength ranges from half a micron to around 70 microns. The focused laser beam as indicated earlier can have power density in excess of 1 MW/mm2 . As laser interacts with the material, the energy of the photon are absorbed by the work material leading to a rapid substantial rise in local temperature. This, in turn, results in melting and vaporization of the work material and finally material removal.
Dissimilar Metal Welding - Issues, Solution & TechniquesVarun K M
Factors to be considered while welding dissimilar metals.
What are the issues faced?
What are different solutions and techniques to overcome this issues ?
The presentation also contain some case case studies to get a better understanding.
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.
Metal matrix composites (MMCs) possess significantly improved properties including highspecific strength; specific modulus, damping capacity and good wear resistance compared to unreinforced alloys. There has been an increasing interest in composites containing low density and low cost reinforcements. Among various discontinuous dispersoids used, fly ash is one of the most inexpensive and low density reinforcement available in large quantities as solid waste by-product during combustion of coal in thermal power plants. Hence, composites with fly ash as reinforcement are likely to overcome the cost barrier for wide spread applications in automotive and small engine applications.
Wire arc additive manufacturing (WAAM) is a crucial technique in the fabrication of 3D metallic structures. It is increasingly being used worldwide to reduce cost and time. Generally, AM technology is used to overcome the limitations of traditional subtractive manufacturing (SM) for fabricating large-scale components with lower buy-to-fly ratios. It became interesting for scientists and manufacturers due to its ability to produce fully dense metal parts and large near-net-shape products. WAAM is mostly used in modern industries, like aerospace industry. There are three heat sources commonly used in WAAM: metal inert gas welding (MIG), tungsten inert gas welding (TIG), and plasma arc welding (PAW). MIG is easier and more convenient than TIG and PAW because it uses a continuous wire spool with the welding torch. Unlike MIG, tungsten inert gas welding (TIG) and plasma arc welding (PAW) need an external wire feed machine to supply the additive materials. WAAM is gaining popularity in the fabrication of 3D metal components, but the process is hard to control due to its inherent residual stress and distortion, which are generated by the high thermal input from its heat sources. Distortion and residual stress are always a challenge for WAAM because they can affect the component’s geometric accuracy and drastically degrade the mechanical properties of the components.
This research was a part of my Dual Degree Thesis and presented at The Minerals Metals and Materials Society Annual Meeting and Conference held at Seattle, WA in 2010.
RTM is a low-pressure molding process, where a mixed resin and catalyst are injected into a closed mold containing a fiber pack or preform . when the resin has cured the mold can be opened and finished component removed.
LASER BEAM MACHINING - NON TRADITIONAL MACHININGSajal Tiwari
Laser Beam Machining or more broadly laser material processing deals with machining and material processing like heat treatment, allowing, cladding, sheet metal bending etc. Such processing is carried out utilizing the energy of coherent photons or laser beam, which is mostly converted into thermal energy upon interaction with most of the materials. Nowadays, the laser is also finding application in regenerative machining or rapid prototyping as in processes like stereolithography, selective laser sintering etc. Laser stands for light amplification by stimulated emission of radiation. The underline working principle of a laser was first put forward by Albert Einstein in
1917 through the first industrial laser for experimentation was developed around the 1960s. The laser beam can very easily be focused using optical lenses as their wavelength ranges from half a micron to around 70 microns. The focused laser beam as indicated earlier can have power density in excess of 1 MW/mm2 . As laser interacts with the material, the energy of the photon are absorbed by the work material leading to a rapid substantial rise in local temperature. This, in turn, results in melting and vaporization of the work material and finally material removal.
Dissimilar Metal Welding - Issues, Solution & TechniquesVarun K M
Factors to be considered while welding dissimilar metals.
What are the issues faced?
What are different solutions and techniques to overcome this issues ?
The presentation also contain some case case studies to get a better understanding.
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.
Metal matrix composites (MMCs) possess significantly improved properties including highspecific strength; specific modulus, damping capacity and good wear resistance compared to unreinforced alloys. There has been an increasing interest in composites containing low density and low cost reinforcements. Among various discontinuous dispersoids used, fly ash is one of the most inexpensive and low density reinforcement available in large quantities as solid waste by-product during combustion of coal in thermal power plants. Hence, composites with fly ash as reinforcement are likely to overcome the cost barrier for wide spread applications in automotive and small engine applications.
Wire arc additive manufacturing (WAAM) is a crucial technique in the fabrication of 3D metallic structures. It is increasingly being used worldwide to reduce cost and time. Generally, AM technology is used to overcome the limitations of traditional subtractive manufacturing (SM) for fabricating large-scale components with lower buy-to-fly ratios. It became interesting for scientists and manufacturers due to its ability to produce fully dense metal parts and large near-net-shape products. WAAM is mostly used in modern industries, like aerospace industry. There are three heat sources commonly used in WAAM: metal inert gas welding (MIG), tungsten inert gas welding (TIG), and plasma arc welding (PAW). MIG is easier and more convenient than TIG and PAW because it uses a continuous wire spool with the welding torch. Unlike MIG, tungsten inert gas welding (TIG) and plasma arc welding (PAW) need an external wire feed machine to supply the additive materials. WAAM is gaining popularity in the fabrication of 3D metal components, but the process is hard to control due to its inherent residual stress and distortion, which are generated by the high thermal input from its heat sources. Distortion and residual stress are always a challenge for WAAM because they can affect the component’s geometric accuracy and drastically degrade the mechanical properties of the components.
This research was a part of my Dual Degree Thesis and presented at The Minerals Metals and Materials Society Annual Meeting and Conference held at Seattle, WA in 2010.
Modeling and Simulation of Base Plate of Friction Stir Welding-Advanced Weldi...ijsrd.com
Friction stir processing is an emerging technique based on the principles of friction stir welding (FSW). It is a solid-state joining method that is energy efficient, environmentally friendly, and versatile. It is considered by many to be the most significant development in metal joining in a decade. The basic concept of friction stir processing is remarkably simple. A rotating tool with pin and shoulder is inserted in the material to be joined, and traversed along the line of interest. The heating is localized, and is generated by friction between the tool and the work piece, with additional adiabatic heating from metal deformation. A processed zone is produced by movement of material from the front of the pin to the back of the pin.
Experimental Investigation of Friction Stir Welding Of Aluminum Aa6061 Alloy ...iosrjce
The combination of wrought aluminum-magnesium-silicon alloy confirming to aluminum AA6061
alloy widely accepted because of light weight fabrication structures, high strength to weight ratio and good
corrosion resistance. Friction Stir Welding(FSW) process is an emerging solid state joining process in which
the material that is being welded does not melt and recast when compared to fusion welding process that are
routinely used for joining structural aluminum alloys. In this FSW process a non consumable tool is used to
generate frictional heat in the abutting surfaces. Experiments for surface roughness, Rockwell hardness and
tensile tests are carried out and reported in this paper. The base material used for friction stir welding is
aluminum AA 6061 alloy. Surface roughness values decreases with the increase in speed of the tool and also
there exists an optimum speed to have the good surface finish. Hardness increases with decrease in speed of the
tool but increases after reaching a certain value. Tensile strength increases with the increase in speed of the
tool and also there exists an optimum values for particular feed of the tool.
EXPERIMENTAL ANALYSIS OF THE WELD STRENGTH IN FRICTION STIR WELDING (FSW) OF ...IAEME Publication
This research deals with the determination of the weld strength of the aluminum alloy of different grades in friction stir welding (FSW). The different grades of the plates are welded by the
different tool geometry namely as cylindrical tool and the tapered threaded tool. During the welding the rotational speed of tool and feed rate of the tool are kept constant. Testing of the specimens is carried out by ASME –SEC-IX and the weld strengths are compared.As a result it is found that the
threaded tool geometry gives the better weld strength and also the surface finish.
Characterization and processing of friction stir welding on copper weldseSAT Journals
Abstract FSW(Friction Stir Welding) is a welding technology will be a part of different metals with sensible properties. During this paper, fsw attachment b/n steel, aluminum and copper plates with thicknesses of 3 millimeter was welded. Here we tend to had considered completely different completely different} materials with different combinations i.e copper and copper, copper and aluminum, aluminum & stainless steel, stainless steel & copper. Friction Stir Welding experiments were employed to get the good wieldable properties by maintaining the rpm speeds to 1120 revolutions per minute and attachment speed within the limit of 14-112 mm/min and here we can adjust the pin profile of the location respect to the line butt. Micro struc analysis can be done for examine the parent and the welded material. Cutting and sectioning of the welded pieces for metallographic analysis of the planes which are perpendicular for the attachment and the travelling direction & which is parallel to the friction welding was done. Here the mechanical properties of welding which was were determined by employing the same standard micro hardness and also tensile hardness testing and finding the maximum elongation of the metals to the properties of fsw. From experimental fsw process it can be found the pin profile and also the rotational speed, feed is an important in manufacturing of free welds in fsw of aluminum, copper and steel. Key Words: FSW, Aluminum, copper, stainless steel.
EXPERIMENTAL INVESTIGATION AND MATERIAL CHARACTERIZATION OF A356 BASED COMPO...sathish sak
Recently friction stir processing (FSP) has emerged as an effective tool for enhancing sheet metal properties through microstructure modification. Significant grain refinement and homogenization can be achieved in a single FSP pass leading to improved formability, especially at elevated temperatures.
FSP is a solid-state process where the material within the processed zone undergoes intense plastic deformation resulting in dynamically recrystallized grain structure.
Most of the research conducted on FSP focuses on aluminum alloys. Despite the potential weight reduction that can be achieved using Titanium dioxide(B4C) alloys.
In this work, we examine the possibility of using FSP to modify the microstructure and properties of commercial A356-B4C alloy particles. The effect of various process parameters on thermal histories, resulting microstructure and properties to be investigated.
PARAMETERS OF FRICTION STIR PROCESSING ALONG WITH REINFORCEMENT OF COMPOSITIO...Journal For Research
Friction stir processing (FSP) is a novel technique used for the enhancing the mechanical and metallurgical properties of the material and also to make composites of the material. In this study, an attempt is made to synthesize the composites of AA6063 and tungsten carbide particles with 5 µm particle size were added reinforcement. The tool shoulder is varied from 16 mm to 20 mm. The other parameters such as tool rotational speed of 1400 rpm and transverse speed of 50 mm/min are kept constant. The friction stir processing tool is made of high chromium high carbon steel with a pin length of 4 mm and pin diameter of 6 mm is used. The 18 mm shoulder diameter produces much finer grain size with tungsten carbide reinforced particles rather than the tools having shoulder 16 mm and 20 mm diameter. The maximum tensile strength and micro hardness achieved is 260 N/mm2 and 135 Hv respectively. In case of the tool having 16 mm diameter produces less amount of heat due to lesser contact with the workpiece material and the tool having 20 mm diameter, over heat the workpiece material due to more contact area with the workpiece and causes no proper plastization and flow of the material within the processed zone by friction stir processing and produces courser grain size.
Manufacturing of Surface Composite Al6351/SIC Using Friction Stir ProcessingIJSRD
Friction stir welding (FSW) is a relatively new solid-state joining process. This joining technique is energy efficient, environment friendly, and versatile. In particular, it can be used to join high-strength aerospace aluminum alloys and other metallic alloys that are hard to weld by conventional fusion welding. FSW is considered to be the most significant development in metal joining in a decade. Recently, friction stir processing (FSP) was developed for microstructural modification of metallic materials. In this study, SiC particles and Methanol paste were incorporated by using Friction Stir Processing (FSP) into the 6351 aluminum alloy to form particulate composite materials. Samples were subjected to traverse speeds of the FSP tool with and without Paste (SiC+ Methanol). Microstructural observations were carried out by employing optical microscopy of the modified surfaces. For the 100% overlapping, No. of passes caused grain modification in the processed zone.
Experimental Study on Surface Roughness by Using Abrasive ParticlesIJERA Editor
New advancement of technology and never satisfying demands of the civilization are putting huge pressure on the natural fuel resources and these resources are at a constant threat to its sustainability. Surface finish has a vital influence on functional properties such as wear resistance and power loss due to friction on most of the engineering components. Voltage, mesh number, revolutions per minute (rpm) of electromagnet, and percentage weight of abrasives has been identified as important process parameters affecting surface roughness. The experiments were planned using response surface methodology and percentage change in surface roughness (ΔRa) was considered as response. Analysis of experimental data showed that percentage change in surface roughness (ΔRa) was highly influenced by mesh number followed by percentage weight of abrasives, rpm of electromagnet, and voltage. The process has been investigated extensively in the finishing of cylindrical surfaces. The surface finish was found to improve significantly with an increase in the grain size, relative size of abrasive particles vis-à-vis the iron particles, feed rate and current. Super finishing is a micro-finishing process that produces a controlled and smooth surface condition on work pieces. It is not primarily a sizing operation, its major purpose is to produce a surface on a work piece capable of sustaining uneven distribution of a load by improving the geometrical accuracy. The wear life of the parts micro finished to maximum smoothness is extended considerably. According to the design of experimentation, mathematical model for Lapping operation on advance ceramic material is proposed. In order to get minimum values of the surface roughness, optimization of the mathematical model is done and optimal operation of the examined factors is going to be determined. The obtained res
REVIEW ON MECHANICAL PROPERTIES OF NON-ASBESTOS COMPOSITE MATERIAL USED IN BR...ijiert bestjournal
Metallic matrix composites are combinations of two or more different metals inter metallic compounds or second phases in which dispersed phases are embe dded within the metallic matrix. They are produced by controlling the morphologies of the constituents to achieve optimum combination of properties. Properties of the composites depend on the properti es of the constituent phases,their relative amount,and dispersed phase geometry including particle siz e,shape and orientation in the matrix. In this pap er,The mechanical properties,behaviour and micro stru ctural evolution of aluminium metal matrix metallic composites fabricated under various process conditi ons were investigated to understand their process- structure�property relations by optimization proces s. Addition of silicon carbide to aluminum has show n an increase in its mechanical properties.
A New Surface Modification Technique and Their Characterisation: Friction Sti...IJERA Editor
Since aluminium alloy is a well-known light alloys to use in aerospace and automotive industries. Therefore, a
new method, so far little known in metal forming industries, is the friction stir processing of surface layers.
Friction stir processing (FSP) is an emerging surface engineering solid-state technology which provides the
ability to thermomechnically process selective locations on the materials surface and to enhance specific
properties to some considerable depth. However, from a practical point of view it is important to determine the
impact of FSP conditions, therefore, a tool rotation speed, travel rate, pressure force as well as the shape and
type of tool on the moment acting to heat generated in the stirring area. The heat generated in the area being
processed and the level of plastic strain are factors having a decisive effect on microstructural changes, and,
consequently, on the mechanical and functional properties of newly formed areas. In this phenomena that the
main FSP features have been investigated through OM (optical microscopy), SEM (scanning electron
microscopy), FESEM (field emission scanning electron microscopy), TEM (transmission electron microscopy)
and mechanical properties. Moreover, aluminium alloy being an age-hardening response to evaluated through
Vicker’s hardness measurement a typical characterisation at present task. The research of the FSP of surface
layers, so far has been focused mainly on the metallurgical analysis of microstructural changes in modified
aluminium alloys.
STUDY OF RECAST LAYERS AND SURFACE ROUGHNESS ON AL-7075 METAL MATRIX COMPOSIT...ijmech
Demand for low weight to strength ratio for exclusive application in automobile and aerospace components created scope for advance studies on Metal Matrix Composites (MMCs). However, machining of MMCs challenges for conventional machining processes due to uneven hardness, matrix of composites and undesired tool life. Electric Discharge Machining (EDM) is one of the unconventional material removal process, which offers alternatives for machining of MMCs because, being a non-contact process it can be machine excessive harder material, intricate shape with better surface finish and tool life. The evolved heat during EDM process and subsequent flushing of machined debris and rapidly resolidified layer is formed by the re-solidification of residual molten material on the machined surface during the EDM process leaves behind recast layers which is extremely hard and brittle. In the presents study optimization of process parameters to minimize the surface roughness of the rapidly resolidified layer of Al 7075 MMC while
machining using EDM process is carried out using the Taguchi tequniues. The gap current, pulse on-time and pulse off-time were considered as process parameters. The formation of resolidified layers is investigated in terms of the surface roughness as response variables inside the hole and near the hole while EDM drilling.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
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Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
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introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
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Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
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Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
3. Friction Stir Processing (FSP)
Friction Stir Processing (FSP) is a novel surface modifying technique
that provides microstructural modification and control in the near-
surface layer of metal components.
FSP provides the ability to thermomechanically process selective
locations on the structure’s surface and to some considerable depth
to enhance specific properties
FSP was developed based on the basic concepts of Friction Stir
Welding (solid state welding process), but FSP is used to modify the
local microstructure and doesn’t join metals together
4. Working Principle of FSP
A specially designed non-
consumable cylindrical tool is rotated
and plunged into the selected area, to
friction process the required location
within a plate or sheet
Tool has a small diameter pin with a
concentric larger diameter shoulder
Tool shoulder and length of entry
probe control the penetration depth
5. Working Principle of FSP
When tool descended to the part, the
rotating pin contacts the surface, rapidly
friction produced between tool pin and
metal surface heats and softens a small
column of metal
Rotating tool provides:
Continuous heating of work piece
Plasticizing metal
Transporting metal from the leading
face of the pin to its trailing edge
6. Working Principle of FSP
When the shoulder contacts the metal
surface, its rotation creates additional
frictional heat and plasticizes a larger
cylindrical metal column around the
inserted pin
The shoulder additionally provides a
forging force that contains the upward
metal flow caused by the tool pin
7. Working Principle of FSP
• During FSP, work piece and the tool
are moved relative to each other such
that the tool traverses, with
overlapping passes, until the required
area is processed
• The processed zone cools, without
solidification, as there is no liquid,
forming a defect-free recrystallized,
fine grain microstructure
8. Applications of FSP
FSP has been shown as an effective technique in following
applications
To fabricate surface composites
To refine microstructure of cast light alloys
To produce fine-grain microstructure, which exhibits
Superplasticity
9. Surface Composites
• Ceramic phase reinforcement in metals makes them as potential structural
materials for aerospace and automobile industries
• These composites also suffer from reduction of ductility and toughness due
to incorporation of non-deformable ceramic phases
• Most of the components in these applications are mainly depends on their
surface properties such as wear resistance
• In these cases, it is desirable to incorporate ceramic phases to only the
surface layer of components
• While the bulk of components retain the original composition and structure
with higher toughness
10. Why FSP for fabrication of Surface
Composites?
• The existing techniques are based on liquid phase processing at high
temperatures (>M.P.)
• It is hard to avoid interfacial reaction between reinforcement and metal
matrix and formation of some detrimental phases
• Critical control of processing parameters is necessary to obtain ideal
solidified microstructure in surface layer
• If processing of surface composite is carried out at temperatures below
melting point of substrate, the problems mentioned above can be avoided
• So FSP is the best suitable process for fabricating surface composites
11. Fabrication of Surface Composites
Particles to be incorporated was filled on the machined groove on the
plates or thin layer of particles made over the plate by suitable
technique and then it was processed by FSP
Some of the reviewed systems and their hardness
MICROHARDNESS HV
SUBSTRATE SURFACE COMPOSITE
A356 + 15 vol% SiC 88 171
5083 + 27 vol% SiC 85 173
AZ61 + 10 vol% nano-SiO2 60 105
AZ31 + SiC 41 80
AZ31 + MWCNT 41 78
12. Microstructural Refinement Cast Al and
Mg Alloys
Al and Mg alloys are widely used to cast high-strength components
in the aerospace and automobile industries because of their high
strength with good casting characteristics
Some of the mechanical properties of cast alloys, in particular
ductility, toughness and fatigue resistance are limited by porosity,
coarse dendrites, secondary phases and matrix grains
Various modification and heat-treatment techniques have been
developed to refine the microstructure, FSP has more advantages
over them
13. Al alloys (Al-Si-Mg(Cu))
Addition of eutectic modifiers (Na, Sr, etc.) cannot eliminate the porosity
effectively and redistribute the Si particles uniformly
Friction Stir Processing (FSP)
Break-up the coarse Si particles and disperse them into the matrix
Break-up the coarse aluminum dendrites and refine the grain structure
Break-up the coarse precipitates(Mg2Si(CuAl2)) and dissolve part or
most of them into the matrix
Eliminate the casting porosity
14. Mg alloys (Mg-Al-Zn)
As-cast structure is characterized by coarse α-Mg dendrites and a network-like
eutectic β-Mg17Al12 phase along the grain boundaries
Functions of FSP is to
Refine and homogenize the microstructure
Dissolve the β-phase into the magnesium matrix
A Solution Treatment and an aging is used to modify the morphology and
distribution of the β-phase to enhance the mechanical properties
ST and Aging were time consuming, resulting in increased material cost,
surface oxidation and grain coarsening
15. Microstructural Refinement
• From the table, it is clear that friction stir processing effective
method to improves the mechanical properties of cast Al and Mg
alloys
MATERIAL CONDITION YS MPa UTS MPa E %
A356 As-Cast
As-FSP
132
140
169
238
3
38
AZ91 As-Cast
As-FSP
75
140
101
248
2.5
8.7
16. Superplasticity
Superplasticity, which is the capability of solid crystalline material to
deform well beyond its usual breaking point, usually over 200% during
tensile deformation in specific temperature region
Super Plastic Forming (SPF) helps in creating very complex shapes from
sheet materials at low deformation stresses and reducing both weight and
forming costs
Basic requirements necessary for achieving structural superplasticity are
fine grain size, typically less than 15 µm.
thermal stability of the fine microstructure at high temperatures
17. Superplasticity
In FSP, the combination of large plastic strain and temperature results in
recrystallized smaller grains and break-up of constituent particles , it is likely to
generate more nucleation sites
FSP creates microstructure containing fine grains with large grain boundary
misorientations
Finer constituent particles lead to lower cavitations, thus increasing superplastic
elongation
FSP can be performed in the selected regions to impart superplastic properties
locally. No need of going for high cost conventional superplastic forming
19. Conclusions
Friction Stir Processing is the effective technique (by locally alters
the microstructure )
To produce surface composites
To improve mechanical properties of cast light alloys
To incorporate Superplasticity
Future studies in this field includes material flow, tool geometry
design, tool wear and microstructural stability
20. References
R.S. Mishra, Z.Y. Ma, “Friction stir welding and processing” Materials Science
and Engineering R 50 (2005)
L.B. Johannes, I. Charit, et al “Enhanced Superplasticity through friction stir
processing in continuous cast AA5083 aluminum”, Materials Science and
Engineering A 464 (2007)
Z.Y. Ma, A.L. Pilchak, M.C. Juhas and J.C. Williams, “Microstructural
refinement and property enhancement of cast light alloys via friction stir
processing”, Scripta Materialia 58 (2008)
R.S. Mishra, Z.Y. Ma, I. Charit “Friction stir processing: a novel technique for
fabrication of surface composite”Materials Science and Engineering A341 (2003)
M.W. Mahoney1
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