GUIDED BY
Mr. S.S.Nivas M.E.,
Asst prof/ Mechanical
A.V.C COLLEGE OF ENGINEERING
Mr. S. Rajamuthamilselvan M.E.,
Asst prof / Mechanical
Annamalai University
PRESENTED BY
M.Dinesh
(80107144012)
S.Manikandan
(80107144023)
P.Manikandan
(80107144024)
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 A composite material is a combination of two or more
chemically distinct materials to form a stronger material.
 The term “composite” broadly refers to a material system
which is composed of a discrete constituent (the
reinforcement) distributed in a continuous phase (the
matrix), and which derives its distinguishing characteristics
from the properties of its constituents, from the geometry
and architecture of the constituents, and from the properties
of the boundaries (interfaces) between different constituents.
 Composite materials are usually classified on the basis of the
physical or chemical nature of the matrix phase, e.g.,
polymer matrix, metal-matrix and ceramic composites.
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1. To fabricate 7075Al/SiCp composites through stir casting
technique
2. To study tensile strength of 7075Al/SiCp composites
3. To study impact strength of 7075Al/SiCp composites
4. To study hardness of 7075Al/SiCp composites
5. To study micro structure of composite materials
3
• High performance aluminium centric material systems. The
reinforcement inAMCs could be in the form of
continuous/discontinuous fibres, whisker or particulates, in
Aluminium matrix composites (AMCs) refer to the class of
light weight volume fractions ranging from a few percent to
70%.
• Aluminum matrix composites (AMCs) have been widely
studied since the 1920s.
• They offer a large variety of mechanical properties depending
on the chemical composition of the Al-matrix. They are usually
reinforced by Al2O3, SiC, C but SiO2, B, BN, B4C, AlN may
also be considered
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STIR CASTING PROCESS
• One of the prominent and economical route for
development and processing of metal matrix composites
materials.
• Properties of these materials depend upon many
processing parameters and selection of matrix and
reinforcements. Literature reveals that most of the
researchers are using 2, 6 and 7075 aluminum matrix
reinforced with SiC particles for high strength properties
whereas, insufficient information is available on
reinforcement of "Al2O3" particles in 7075 aluminum
matrix.
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6
7
8
Tensile test
• Impact test
• Hardness test
• Microscopic test
•
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IMPACT TEST
SNO
SIZE OF THE
SPECIMEN
LOAD IN
JOULES
1
2
3
4
5
6
7
8
15
15
15
15
20
20
20
20
18
16
18
20
28
26
24
32
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HARDNESS TEST:
S MATERIAL
N
O
1 15
2 15
3 15
4 15
5 20
6 20
7 20
8 20
MIN
LOAD
kgf
60
60
60
60
60
60
60
60
MAX
LOAD
kgf
100
100
100
100
100
100
100
100
Avg
SCAL R.H.NO
E
B
B
B
B
B
B
B
B
90
75
92
71
73
65
66
61
90
91
95
89
74
85
82
77
94
89
91
90
86
79
72
74
91.3
85
92.6
83.3
77.6
76.6
73.3
70.6
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Tensile test:
s.no Materi Peak Displ
al
load acem
in
ent at
KN FMAX
In
mm
1
5m12.4 7.160
10%
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Break
ing
load
in KN
Max
displa
ceme
nt in
mm
Area
in
sq.m
m
Ulti
mate
stress
in
KN/s
q.mm
3.830 7.350 50.28 0.247
6
UTS
in
mpa
247
2
5m15%
12.2 9.440 2.201 9.710 50.28 0.244 244
94
6
3
5m20%
16.9 11.60 2.637 15.59 50.28 0.337 337
47
8
0
6
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Microstructure of the
composites
ADDITION OF
sic-10%
ADDITION OF
sic-15%
ADDITION OF sic20%
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(1) Brake rotors for German high speed train and made from a
particulate reinforced aluminum alloy. Compared to
conventional parts made out of cast iron with 120 kg/piece, the
76 kg of the AMC rotor offers an attractive weight saving
potential.
(2) The braking systems (discs, drums, calipers or back-plate)
of the New Lupo from Volkswagen made from particulate
reinforced aluminum alloy supplied by Duralcan.
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(3) AMC continuous fiber reinforced pushrods produced by 3M
racing engines. These pushrods weigh 40% as much as steel, are
stronger and stiffer, and have high vibration damping.
(4) AMC wires also developed by 3M for the core of a electrical
conductors. The unique properties of this type of conductor offer
substantial performance benefits when compared to the currently
used steel wire reinforced conductors.
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Greater strength
Improved stiffness
Reduced density(weight)
Controlled thermal expansion coefficient
Thermal/heat management
Improved abrasion and wear resistance
Control of mass (especially in reciprocating applications)
Improved damping capabilities.
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Thank you
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