Comparison of mechanical and wearing properties between LM6, LM6/B4C and LM6/B4C/Gr aluminium metal matrix composites

Abstract

Due to greater specific modulus, better wear resistance, excellent specific strength, and declined coefficient of thermal expansion value, particulate reinforced aluminum matrix composites have acquired appreciable consideration. Casting route and powder metallurgy are the commonly used fabrication methods from which we select stir casting technique due to its simplicity and low expense. In this study mechanical properties like tensile strength, yield strength, hardness, wear, coefficient of friction (COF) and frictional properties of light metal (LM6), LM6/ Boron Carbide (B4C) and LM6/B4C/Graphite (Gr) 2% were analyzed with the aid of Universal Testing Machine (UTM), Rockwell Hardness Tester and Pin on Disk Tester. B4C was chosen due to its excellent reinforcement properties compared to silicon carbide (SiC) and alumina. Gr (2%)was added in one sample to obtain better tribological as well as better sliding lubricating characteristics. The test outcomes reveal that by increasing the percent of B4C particles in theLM6 matrix, the mechanical as well as tribological properties are improved and the new material developed can replace conventional LM6 aluminium alloy in its applications.