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 1–3 wt.%Ti were newly designed and characterized in detail. The additions of Ti (especially, ~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)3Ti phase finely dispersed in the matrix.
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