Name:Gurparbatpal Singh Roll no.- 11393019 M.tech. -2nd sem

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Alluminium metal matrix composites

AT A GLANCE…

− it must be man-made; − it must be a combination of at least two

chemically distinct materials (one being alluminium ) with a distinct interface separating the constituents;

− the separate materials must be combined three dimensionally;

− it should create properties which could not be obtained by any of the individual constituents.

Alluminium matrix composites can be defined as follows :

Reinforcements used for al alloys

Typical Reinforcements geometries for Metal Matrix Composites

• Continuous fibre composites − Liquid state techniques − Solid state techniques • Discontinuously reinforced composites − Solid state routes − Liquid state route − Spray methods • In situ production methods

Manufacturing techniques

Die casting of Discontinuously reinforced composites

• Automotive sector • Aerospace applications • Electronic and communication

applications • Sports and leisure market applications

APPLICATIONS

AN ABSTRACT FROM THE RESEARCH PAPERS

Among MMCs ,al alloy based composites were always on the forefront of research.

AMMCs have been by now established themselves as a suitable wear resistant material especially for sliding wear applications.An attempt has been made in this paper to highlight the effect of dispersing SiC IN 2014 base alloy adopting the liquid metallurgy route on different wear modes like Abrasion,Sliding,Erosion etc.

Alluminium alloy based metal matrix composites: A potential material for wear resistant applications:

THE Composite used in the present study were prepared by the liquid metallurgy technique.The constituents in appropriate proportion conforming to 2014 and7075 alloys system consisting of AL-4.4CU-0.5Mg-0.8,Si-0.8Mn and 1.6Cu,2.5 Mg,0.3 Cr, respectively,were melted in a gas fired furnace in a graphite crucible.

DRY SLIDING WEAR TEST

The tests were carried out on a PIN-ON-DISC wear testing machine in which the specimen was held against a rotating steel disc and this sliding motion results into the wear of the pin as shown in fig…

SLIDING WEAR TEST..

The weight loss was calculated from the difference in weight between the initial weight and weight after a specified no. of rotations.The volume loss is calculated by dividing the weight loss by the density of the material or the wear rate is calculated by dividing the volume loss by total distance traversed .

Experiments were carried out at two loads of 1 and 3 Mpa and at two speeds of rotation corresponding to 200 and 750rpm upto sliding distance of 2500m.

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The worn surface and subsurface was studied under the Scanning electron microscope(SEM) to understand the nature of material removal and surface damage and to compare between material removal mechanism between the different types of wear.

RESULTS: IT IS Observed that ageing improves the wear rate in

both the alloy and composite.o Increasing speed of rotation decreases the volume loss for both

the alloy and composite,because the higher speed of rotation results in lesser volume loss which is probably due to less time that the surface get to slide against each other.

o This is to say that if these composites were used as making engineering components ,they would perform better at higher speeds and lower loads.

Worn surface studies

The machine consist of a cylindrical specimen traversing on the curved surface of a large cylindrical drum.An abrasive cloth (emery paper of embedded with siC particles or AL2O3 abrasive was used as abrasive medium).Load was applied on the specimen with a cantilever mechanism.The sample was made to slide over the abrasive paper fixed on the rotating drum.The weight loss can be calculated similarly as we done before.

ABRASIVE WEAR BEHAVIOUR OF AL-SiC COMPOSITES USED FOR AUTOMOTIVE PARTS

THANK YOU