Effect of Sn Addition in the Microstructure Refinement and Corrosion Resistance of Cu-Zr-Al-Ag Alloy

摘要

In this paper, a composition of known high glass-forming ability, Cu 42 Zr 42 Al 8 Ag 8 and a novel Cu 42 Zr 42 Al 8 Ag 4 Sn 4 , were produced by suction-casting. After rapid solidification of both alloys, X-ray diffraction patterns along with crystallite size estimation by Scherrer equation and scanning electron microscopy images revealed a refined microstructure, composed mainly by AlCu 2 Zr, CuZr 2 and Cu 10 Zr 7 phases. Transmission electron microscopy indicated the presence of small crystalline precipitates in the Cu 42 Zr 42 Al 8 Ag 4 Sn 4 suction-casted sample. Polarization curves showed a higher passivation current in the Sn containing sample, suggesting a decrease in corrosion resistance.