Effects of Y Alloying on Thermal Stability and Corrosion Resistance of Cu-Zr-AI Metallic Glass

摘要

The (Cu_(50)Zr_(45)Al_5)_(100-x)Y_x(x=0,1,2, and 3) alloys samples were prepared by copper mold suction casting method. The effect of the addition of Y on the structure, glass-forming ability, thermal stability and corrosion behaviors of the base BMG (Cu_(50)Zr_(45)Al_5) were investigated by means of XRD, DSC, DTA and electrochemical polarization. The results showed that Cu_(10)Zr_7 and Zr_2Cu phases are precipitated when Y addition exceeds 3at%, otherwise the alloys are fully amorphous state. Minor addition Y improved the thermal stability of the base alloy. The corrosion resistance of BMG alloy is deteriorated in 3.5% NaCl solution with addition of Y element as indicated by the corrosion potential and corrosion current density.