Microstructure and mechanical properties of rapidly solidified As-Si-Fe-X base alloys

Abstract

The effects of Ti and V additions on microstructure and mechanical properties of rapidly solidified Al-20w/oSi-5w/oFe alloy were investigated, respectively. The hypereutectic Al-Si-Fe base alloys were gas-atomized and hot-extruded to make the consolidated bars. The addition of 2w/oTi increased wear resistance and mechanical properties such as tensile strength, hardness and elongation. Based on TEM analyses, it can be concluded that the improved properties in the Al-Si-Fe alloys containing Ti were caused by the formation of DO22-(Al,Si)(3)Ti phase finely dispersed in the matrix. On the contrary, V addition was less effective than Ti, in that V could not decompose as the expected Al10V phase with a large v/o of precipitates; V was mostly solid-solutionized in the other unknown phase. (C) 1997 Elsevier Science Ltd.