ASSESSMENT OF MECHANICAL AND TRIBOLOGICAL PROPERTIES OF ALUMINIUM METAL MATRIX COMPOSITE BY CENTRIFUGAL CASTING

Mechanical Engineering

Aluminium 7075 alloy constitutes a very important engineering material widely employed in the aircraft, aerospace and automotive industry for the manufacturing of different parts and components. It is due to its high strength to density ratio that it a sought after metal matrix composite. Functionally graded materials (FGMs) are materials that possess variance in properties across the geometry of the material. They are a class of materials developed from the existing knowledge of material alloying.The functionally graded aluminium metal matrix prepared by centrifugal casting. Aluminium 7075 taken as base metal and titanium dioxide ,silicon nitride is used as reinforcement. In this project, mold preheating temperature ranges 250–350 °C, centrifugal speed kept between 500 rpm, pouring temperature in the range of 740–760 °C having reinforcement particle of weight percentage, with an average particle size of 40- 50 μm yield the maximum of hardness and wear resistance.Using the linear regression model, an effort has been made to optimize the material and process variables to get enhance the mechanical properties. This project delivers a detailed review of the influence of material and process variables on the micro structure, mechanical characteristics of functionally graded aluminium material (FGMs) produced by the centrifugal casting method from previous studies. Also, the basic principle and classification of centrifugal casting to produce FGMs are illustrated. The various mechanical and tribological characteristics of FGM like hardness , micro structure examination and wear rate of the specimen were tested. Work is done to develop the functionally graded materials for wear and thermal based application like piston and exhaust valves in Automobile industries.

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