Tribological Behaviour of AA 7075 Hybrid Composite using Stir Casting Method

Abstract

This work deals with the effect of hard ceramic particles on Tribological properties of AA 7075 Hybrid metal matrix composites. The liquid stir casting method has been used for preparing Hybrid metal matrix composites. AA 7075 used as base material and Al2O3, B4C and TiO2 used as reinforcement materials. Different weight percentages of reinforcement were used for three different compositions of composites. The dry sliding wear tests were done on pin-on disk apparatus by varying the applying load. The wear rate and coefficient of friction was recorded by computer. The Microstructural study was done by using Scanning Electron Microscope (SEM). From the experimentation, the wear resistances of hybrid composites were increased by increasing the weight percentage of Al2O3 with B4C and TiO2. From microstructure studies the stir casting method distributes the ceramic particles uniformly through the aluminium alloy.