Composite formatoin

1. Pamod Kumar Bahidar
Gaurav Kumar Jha
Hariballabha Mahanta
Department of Metallurgical Engineering
Gandhi Institute of Engineering and Technology,
Gunupur
Supervisor
Prof. Ajaya Kumar Pradhan
By

2.  Al is the second most widely used material
 Application range from simple house hold
items to space

3.  High electrical conductivity
 High thermal conductivity
 High oxidation resistance
 Light weight
 Low cost
 Recyclability
 Good ductility and formability
 Impermeable and odorless
 Reflectivity

4.  Low hardness, strength and wear resistance
 Low corrosion resistance under aggressive
environment
 High coefficient of friction or low lubricating
property
 Hence, limited applicability in the fields
requiring a combination of properties as
mentioned in advantages and
disadvantages of aluminium

5.  Alloying
 Heat treatment
 Composite formation

6.  Formation of composite can develop many
properties significantly such as hardness,
wear resistance, lubricating property that is
impossible by any heat treatment or alloying.
 No solubility limitation of the second phase
 More than one kind of reinforcement can be
added to develop many properties
 Wide range of formation techniques available
 Application specific properties can be
developed by controlling the shape, size and
amount of the second phase

8.  Architecture
 Decoration
 Sign boards

9.  Powder metallurgy produces near net shape components. The technique
required few or no secondary operations.
 Parts of powder metallurgy can be produced from high melting point
refractory metals with less cost and difficulties.
 The dimensional accuracy of components produced by this technique is quite
good, therefore no further machining is not required.
 This technique involves high Production Rate along with low Unit Cost.
 It can produce complicated forms with a uniform microstructure.
 Powder metallurgy has full capacity for producing a variety of alloying
systems and particulate composites.
 This technique has flexibilities for producing powder metallurgy parts with
specific physical and mechanical properties like hardness, strength, density
and porosity.
 By using powder metallurgy, parts can be produced with infiltration and
impregnation of other materials to obtain special characteristics which are
needed for specific application.
 Powder metallurgy can be used to produce bi-metallic products, porous
bearing and sintered carbide.
 Powder metallurgy makes use of 100% raw material as no material is wasted
as scrap during process.

10. Author Material Processing
route
Major findings
Atik, 1998 Aluminium/
Alumina
Agitated casting Hardness, tensile strength and impact
strength have been observed to decrease.
However, wear resistance has been observed
to increase.
Ahmad et al. 2007 Aluminium/
Alumina
Powder metallurgy Hardness and density have been observed to
increase with the increase in Al2O3 content.
Dhadsanadhep et al., 2008 Aluminium/
Alumina
Powder metallurgy With the increasing content of Al2O3 hardness
has been observed to increase.
Luangvaranunt et al., 2010 Aluminum-
4
mass%Copp
er/Alumina
Powder Forging The process resulted a heat treatable alloy
with age hardenable characteristics.
Mahboob et al., 2011 Aluminium
/ Alumina
Powder Metallurgy Hardness, strength and ductility has been
observed to increase with the increase in Al2O3
up to 5 wt%.
Radhika et al., 2012 Aluminium/
Alumina/
Graphite
Stir casting Hardness, tensile strength and wear resistance
have been observed to increase with the
increase in Al2O3 content.
Qutub Aluminium
6061/
Alumina
Powder metallurgy The composite has been observed to retain
35% of its tensile strength at 300 oC. Strain to
fracture has been observed to increase with
the increase in temperature up to 250 oC.

11. Metal Powder (Al)
Blending
Cold Compaction
Sintering
Characterization
Al2O3

12.  Greater strength
 Improved stiffness
 Reduced density(weight)
 Improved high temperature properties
 Controlled thermal expansion coefficient
 Thermal/heat management
 Enhanced and tailored electrical performance
 Improved abrasion and wear resistance
 Control of mass (especially in reciprocating
applications)
 Improved damping capabilities

13.  E. Atik, Mechanical properties and wear strengths in aluminium-alumina composites,
Materials and Structures 31 (1998) 418-422.
 K.R. Ahamad, W.J. Lee, R.M. Zaki, M.N. Mazlee, M.W.M. Fitri, S.S. Rizam and J.B.Shamsul,
The microstructure and properties of aluminium composite reinforced with 65 µm
alumina particles via powder metallurgy, ICoSM (2007) 165-167.
 C. Dhadsanadhep, T. Luangvaranunt, J. Umeda and K. Kondoh, Fabrication of Al/AL2O3
composite by powder metallurgy method from aluminium and rice husk ash, Journals of
Metals, Materials and Minerals, 18 (2008) 99-102.
 T. Luangvaranunt, C. Dhadsanadhep, J. Umeda, E. Nisaratanaporn and K. Kondoh,
Aluminium-4 mass% copper/alumina composites produced from aluminium copper and
rice husk ash silica powder by powder forging, Materials Transactions 51 (2010) 756-
761.
 H. Mahboob, S.A. Sajjadi and S.M. Zebarjad, Influence of nanosized Al2O3 weight
percentage on microstructure and mechanical properties of Al-matrix composite,
Institute of Materials, Minerals and Mining 54 (2011) 148-152.
 N. Radhika, S. Subramanian, S. Venkat Prasat and B. Anandavel, Dry sliding wear
behaviour of aluminium/alumina/graphite hybrid metal matrix composites, Industrial
Lubrication and Technology 64 (2012) 359-366.

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