Characterization of Aluminium Alloy 7075 Reinforced with Silicon Carbide Particulates

Abstract

In this study 7075 matrix alloy is chosen and SiC particles having average particle size of 20 μm with four volume fractions of l0%, 15% and 20% and 30%. were incorporated into the alloy at the liquid state Stir casting followed by extrusion. Tensile, Impact, Hardness test were carried out both alloy and composites. The 15 Vol.% SiCp aluminum matrix composites showed the maximum tensile and Yield strength. The results indicate that extrusion can substantially improve the distributed homogeneity of the SiC particles in the matrix, and help to decrease the number of pores and improve interfacial bonding strength of the composites. The yield strength and tensile strength of the composites decrease with increasing the volume fraction of the SiC particles, while the hardness of the composites increases with increasing the volume fraction of the SiC particles. The hardness increases with the aging time until reaching the maximum values, after which the hardness starts to decrease.