Abstract
Zr53.8Cu29.1Ni7.3Al9.8 bulk metallic glass (ZCNA-BMG) and Zr52.8Cu29.1Ni7.3Al9.8Y1 bulk metallic glass (ZCNAY-BMG) were taken to elucidate the kinetic mechanism for the improvement in oxidation resistance upon the addition of yttrium over the temperature range of 400–500 °C. The oxidation kinetics of two BMGs both followed a multiple-stage parabolic-rate law, wherein ZCNAY-BMG exhibited a lower kp and thinner scales consisting of t-ZrO2, m-ZrO2, CuO, AlNi3, Y2O3 and some Al2O3 at T ≥ 450 °C. The Al2O3 phase was only observed in the scale of ZCNAY-BMG at 450 °C due to the crystallization, and resulted in the much lower oxidation rate.
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