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Published July 2010 | Published
Journal Article Open

Oxidation Behavior of a Pd_(43)Cu_(27)Ni_(10)P_(20) Bulk Metallic Glass and Foam in Dry Air


The oxidation behavior of both Pd_(43)Cu_(27)Ni_(10)P_(20) bulk metallic glass (Pd4-BMG) and its amorphous foam containing 45 pct porosity (Pd4-AF) was investigated over the temperature range of 343 K (70 °C) to 623 K (350 °C) in dry air. The results showed that virtually no oxidation occurred in the Pd4-BMG at T < 523 K (250 °C), revealing the alloy's favorable oxidation resistance in this temperature range. In addition, the oxidation kinetics at T ≥ 523 K (250 °C) followed a parabolic-rate law, and the parabolic-rate constants (k_p values) generally increased with temperature. It was found that the oxidation k_p values of the Pd4-AF are slightly lower than those of the Pd4-BMG, indicating that the porous structure contributes to improving the overall oxidation resistance. The scale formed on the alloys was composed exclusively of CuO at T ≥ 548 K (275 °C), whose thickness gradually increased with increasing temperature. In addition, the amorphous structure remained unchanged at T ≤ 548 K (275 °C), while a triplex-phase structure developed after the oxidation at higher temperatures, consisting of Pd_2Ni_2P, Cu_3P, and Pd_3P.

Additional Information

© 2010 The Minerals, Metals & Materials Society and ASM International. Published online: 13 May 2010. This article is based on a presentation given in the symposium "Bulk Metallic Glasses VI," which occurred during the TMS Annual Meeting, February 15–19, 2009, in San Francisco, CA, under the auspices of TMS, the TMS Structural Materials Division, TMS/ASM: Mechanical Behavior of Materials Committee. The authors are thankful for the financial support by the National Science Council of the Republic of China under Grant No. NSC-96-2218-E-011-001. Special thanks are due to Dr. R.T. Huang, NTOU, for the TEM sample preparation and operation assistance. One of the authors (PKL) is very grateful for the financial support of the National Science Foundation International Materials Institutes (IMI) programs (Grant No. DMR 0231320) with Dr. C. Huber as the program director.

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