Influence of Sic- Particulate Addition on the Mechanical

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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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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Influence of Sic- Particulate Addition on the Mechanical