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8/2/2019 Influence of Sic- Particulate Addition on the Mechanical
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AMAR.S.D1, JEGANATHVITTAL.A.S2, PRASHANT.S.N3,
MANJUNATH.D.T4, NAVEEN.K5 Dr.Virupaxi Auradi6
1
1,2,3,4,5 Department of Mechanical Engineering,
6 Asst Professor Department of Mechanical Engineering,Siddaganga Institute of Technology,
Tumkur 560010, Karnataka, India.
30 MARCHMECHOLITES 2012
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PRESENTATION OUTLINE
INTRODUCTION: MMCs THEIR PROPERTIESEXPERIMENTAL DETAILS
PROCESS CHART
TESTS CONDUCTED AND EXPERIMENTAL RESULTS
CONCLUSIONS
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WHAT IS A METAL MATRIX COMPOSITE?
Metal composites that
contain two or morediscrete insoluble phases
Matrix theoretically can beany metal or alloy
Aluminium
Copper Titanium
Steel
Reinforcement
Continuous fibres
Short fibres
Particles
Benefits of MMCs
Increased strength Higher modulus
Improved low cycle fatigue
High wear resistance
Fig 1 : Microstructure of a particulatereinforced MMC(Al6061-6%SiC)
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WHAT IS Al6061-SiC METAL MATRIX COMPOSITE?
Metal composite that contains Al6061 as matrix and SiC as
particulate reinforcement.
Tab 1 :Composition of Al6061
Components Amount(Wt.%)
Magnesium 0.8-1.2
Silicon 0.4-0.8
Iron Max. 0.7
Copper 0.15-0.40
Zinc Max. 0.25
Titanium Max.0.15
Manganese Max. 0.15
Chromium 0.04-0.35
Others 0.05
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APPLICATIONS OF Al 6061-SiC MMCs
Aircraft and aerospace
components Marine fittings Transport Bicycle frames Camera lenses
Drive shafts Electrical fittings and
connectors Brake components Coupling
Tip truck bodies Rail car Pressure vessels Shipbuilding Vehicle bodies
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PROPERTIES OF THE CONSTITUENTS
Properties Al6061 SiC
Elastic Modulus (Gpa) 70-80 410
Poissons Ratio 0.33 0.14
Density (g/cc) 2.7 3.1
Hardness (HB500) 30 2800
Tensile Strength /
Compressive
Strength(Mpa)
115
-------
---
3900
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EXPERIMENTAL DETAILS
Weighted Al6061 alloy was kept in a graphite crucible and the
crucible was heated by keeping the same in electrical furnaceat a temperature of 7300C.
Weighed percentage of silicon carbide ( 0%, 4% and 6% ) washeated separately in a pan to a nominal temperature to
remove moisture content if any,.Molding dies were also heated separately.
Add degassing tablet to avoid blowholes and to reduceporosity.
Once temperature reaches to the prescribed value, add thecalculated percentage of silicon carbide to the molten metaland stirred thoroughly.
Pour the molten metal to the die and allow it to cool.
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CONTINUED
Stir casting process
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PROCESS CHART
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TESTS CONDUCTED AND
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TESTS CONDUCTED AND
EXPERIMENTAL RESULTS
TENSILE STRENGTH : Specifications
Total length of the Specimen =
150mm Gauge length = 62.5mm Central diameter = 12.5mm
Gripping diameter = 20mm
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Before testing
After testing
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MECHOLITES 2012
96.12
112.86
135.73
0
20
40
60
80
100
120
140
160
1 2 3
TensileStrength(MPa)
Graph Tensile Test
0 4 6
SI.NO Material Tensile strength
(Mpa)
%Elongation
In length mm
1 Al6061 96.12 .120
2 Al6061
4%Sic
112.86 0.1535
3 Al6061
6%Sic
135.73 0.17712
TENSILE TEST RESULTS
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BRINELL HARDNESS TEST
APPARATUS : Hardness testing machine Brinells micrometer
Specimens
Ball indentor of 5m
SPECIMEN PREPARATION :
Diameter of the specimen = 20mm
Thickness of the specimen = 10mm
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TEST SPECIMENS
P = Load in kgfD = dia. of indentor in mmd = diameter of indentation in mm
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BHN RESULTS
Variation in the hardness with different wt% of SiC
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WEAR TEST
The prepared Al6061 with varying weight percentage of SiC
composites subjected to wear test under dry sliding condition.The test were conducted on 6mm diameter, 25mm long
cylindrical specimens against a rotating EN-32 steel disc ( countface ) having hardness 63Rc.
A Ducom Bangalore make, pin-on-disc wear test machine(Model ED-201 ) was used for carrying out these tests.
The tangential friction force and wear were monitored with helpof electronic sensors.
These two parameters were measured as a function of load and
sliding distance.For each type of material, tests were conducted at three different
nominal loads (10N, 20N and 30N ) keeping the sliding speedfixed at 1.8 m/s, for a for a test run of 1000 to 3000m
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RESULTS WEAR TEST(F L d 10N )
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RESULTS:WEAR TEST(For Load 10N )
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SI
NO.
Material Time(min)
Sliding Distance
(m)
Wear in
Hight Loss
(microns)
1 Al606110 1000 7
20 2000 8
30 3000 9
2
Al6061,4% SiC
10 1000 1
20 2000 2
30 3000 2
3
Al6061,6% SiC
10 1000 3
20 2000 2
30 3000 2
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0
1
2
3
4
5
6
7
8
9
0 0.5 1 1.5 2 2.5 3 3.5
Wearinhightloss(um)
Composites of A16061 - wt. % of SiC
Sliding distance 2000m and load 10N
0 4 60
2
4
6
8
10
12
1 2 3
Wearinhightlo
ss(um)
Composites of A16061 -= wt. % of SC
Sliding distance 3000 m and load 20N
0 4 6
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CONCLUSIONS
The significant conclusions of the studies on Al6061-SiC metal
matrix composites are as follows.Liquid metallurgy techniques were successfully adopted in the
preparation of Al6061-SiC composites containing the fillercontents up to 6 wt %age.
Improvements in tensile properties were observed with theaddition of SiC particulates to 6061Al.
Hardness of the composites found increased with increased fillercontent and the increase in hardness of Al6061-SiC compositesare found to be 100 to 120 BHN respectively.
The wear resistance of the composites are higher, furtherthe SiC contributed significantly in improving the wearresistance of Al6061-SiC composites.
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