Effects of Ti-addition on the characteristics of wear resistant Al-Si-Fe base alloys processed via rapid solidification

Abstract

Rapidly solidified Al-Si-Fe base alloys were prepared by gas atomization, hot pressing and extrusion. To optimize wear resistance and mechanical properties, Al-20 wt.%Si-5 wt.%Fe base alloys containing 1 similar to 3 wt.%Ti were newly designed and characterized in detail. The additions of Ti (especially, similar to 2 wt.%Ti) effectively increased the wear resistance and mechanical properties such as tensile strength and hardness; however, the addition of 3 wt.%Ti was not desirable because of the precipitation of the primary Ti7Al5Si12 phase in the as-quenched state. Based on TEM analyses, the improved properties in the Al-Si-Fe alloys containing Ti were found to be due to the formation of the (Al, Si)(3)Ti phase finely dispersed in the matrix.