Air-oxidation of a Pd40Ni40P20 bulk glassy alloy at 250-420 degrees C

作者：Kai W^*; Wu Y H; Jen I F; Ho T H; Hsieh H H

来源：Journal of Alloys and Compounds, 2014, 586: S24-S30.

DOI：10.1016/j.jallcom.2013.01.175

• Oxidation
• Pd40Ni40P20 bulk-metallic glass
• NiO
• Pd3P
• Ni3P

The oxidation behavior of a Pd40Ni40P20 bulk-metallic glass (Pd3-BMG) was studied over the temperature range of 250-420 degrees C in dry air. The Pd3-BMG revealed nearly no oxidation at T %26lt; 300 degrees C, while its oxidation kinetics followed a multiple-stage parabolic-rate law at T %26gt;= 300 degrees C, with its oxidation rates increasing with temperature. In general, the oxidation rate constants (k(p) values) of Pd3-BMG are slightly higher than those of the crystalline counterpart and polycrystalline pure Ni at 300-420 degrees C, indicating that the amorphous alloy exhibited a poor oxidation resistance. An exclusive layer of NiO scale formed on the alloy surface and a Pd-enriched layer was also observed beneath the scale. In addition, the amorphous substrate transferred into two crystalline phases of Pd3P and Ni3P after the oxidation at T %26gt;= 300 degrees C, indicative of the occurrence of phase transformation.

• 出版日期2014-2-15