Microstructure and tribological properties of Cu ss-toughened Cr–Cu–Si metal silicide alloys

Abstract

Wear resistant Cr–Cu–Si metal silicide alloys with different Cu contents were fabricated by the laser melting process. The Cr–Cu–Si alloys have a similar microstructure consisting of the Cr 5Si 3/CrSi dual-phase primary dendrites and the interdendritic Cu-based solid solution (Cu ss). The Cu content has no effect on the phase constitutions of the alloys. The Cr 5Si 3/CrSi dendrite volume fraction and hardness of the Cr–Cu–Si alloys decrease with the increasing Cu content. Wear test results indicate that all the Cu ss-toughened metal silicide alloys have excellent wear resistance and low coefficient of friction. Wear resistance increases and friction coefficient decreases with the decreasing Cu content.