Mechanical properties of Ai-Zn-Mg-Cu matrix composite reinforced with SiC particles

This paper describes a study of the mechanical properties of as-cast and heat treated AA 7075 alloy particulates containing silicon carbide (SiC) particulates of size 100-150 mu m and of contents ranging from 0 % by 6 % 6% weight. The vortex method of production as employed in which the SiC particles were poured into the vortex created 6% stirring the molten metal by means of a mechanical agitator. Subsequent homogenizing heat treatment was performed at 320 degrees C for duration of 1, SiC composition was increased, there was significant increase in the ultimate tensile strenght (UTS) and hardness of the composite, accompained by reductions inits ductility and impact strength. Heat treatment was found to improve signinficantly the ductility and impact strength of the composite, but cause reductions in its UTSand hardness. An attempt is made in the paper to provide explanations for these phenomena.