Abstract
The effect of Si addition on the oxidation of (Cu 43Zr 43Al 7Ag 7) 99.5Si 0.5 bulk metallic glass (CZ43S-BMG) was investigated over the temperature range of 375–500 °C in dry air. The results generally showed that the oxidation rates of the CZ43S-BMG followed a multi-stage parabolic-rate law, and the oxidation rate constants ( k p values) fluctuated with increasing temperature. It was found that the k p values of the CZ43S-BMG were slightly slower than those of the Si-free glassy alloy (Cu 43Zr 43Al 7Ag 7, named as CZ43-BMG). The scales formed on the CZ43S-BMG strongly depend on temperature, consisting of 3 different modifications of ZrO 2 and CuO, and minor amounts of Cu 2O (formed at T ≥ 425 °C) and Al 2O 3 (only detected at 500 °C). In addition, the glassy substrate remained amorphous nature at T ≤ 400 °C, while it transferred to the crystalline phases of Cu 10Zr 7, ZrAl, and ZrSi 2 after the oxidation at higher temperatures.
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