Author(s)

Haiyang Li and Xiangxiang Gao

Corresponding Author

Haiyang Li

ABSTRACT

The oxidation behavior of the Zr52Cu29Al10Ni8 bulk metallic glasses (BMGs) was studied in dry air, at its supercooled liquid region of 400 °C to 450 °C. The oxidation kinetics of the Zr52Cu29Al10Ni8 BMGs followed a multi-stage parabolic-rate law. The two-stage oxidation kinetics was obeyed at 400 °C, and 450 °C datum followed a three-stage kinetic. The parabolic-rate constants (Kp values) fluctuated with the temperature and increased with the increasing temperature. The scales formed on the BMGs were strongly dependent on the temperature, and were composed primarily of tetragonal-ZrO2, Cu10Zr7, minor amounts of Cu2O and CuO, but the disappearance of Cu2O phase and the present of m-ZrO2 occurred at 450 °C. Meanwhile, the Al and Ni elements were never detected in the scales at the supercooled liquid region.

KEYWORDS

Oxidation, microstructure, bulk metallic glass, supercooled liquid region