aLaboratory of Laser Materials Processing and Manufacturing, School of Materials Science and Engineering, Beihang University (formerly Beijing University of Aeronautics and Astronautics), 37 Xueyuan Road, Beijing 100083, China
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 Cr5Si3/CrSi dual-phase primary dendrites and the interdendritic Cu-based solid solution (Cuss). The Cu content has no effect on the phase constitutions of the alloys. The Cr5Si3/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 Cuss-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.