Air-oxidation of a Zr50Cu43Al7 bulk metallic glass at 400-500 degrees C

作者：Kai W^*; Lin P C; Chen W S; Chuang C P; Liaw P K; Huang H H; Hsieh H H

来源：Corrosion Science, 2012, 64: 98-104.

DOI：10.1016/j.corsci.2012.07.006

• XRD
• SEM
• TEM
• Oxidation

Air-oxidation behavior of a Zr50Cu43Al7 bulk metallic glass (ZCA7-BMG) was studied over the temperature range of 400-500 degrees C. The oxidation kinetics of the ZCA7-BMG generally followed a multiple-stage parabolic-rate law with its steady-state parabolic-rate constants (k(p) values) decreasing with increasing temperature, indicative of the occurrence of kinetics inversion. The scales formed on the ZCA7-BMG were strongly dependent on temperature, consisting mostly of tetragonal ZrO2 and CuO, and minor amounts of monoclinic ZrO2 and Cu2O at 400 degrees C, while Cu2O was completely absent at T %26gt;= 450 degrees C. In addition, a minor amount of Al2O3 was further observed after the oxidation at 500 degrees C, whose formation is responsible for the lowest oxidation rate, as compared to those at T %26lt;= 450 degrees C.

• 出版日期2012-11