Oxidation behavior of an Zr53Ni23.5Al23.5 bulk metallic glass at 400-600 °C

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • W. Kai
  • H. H. Hsieh
  • Y. R. Chen
  • Y. F. Wang
  • C. Dong

Detail(s)

Original languageEnglish
Pages (from-to)1459-1465
Journal / PublicationIntermetallics
Volume15
Issue number11
Publication statusPublished - Nov 2007
Externally publishedYes

Abstract

The oxidation behavior of the Zr53Ni23.5Al23.5 bulk metallic glass (BMG) and its crystalline counterpart was investigated over the temperature range of 400-600 °C in dry air and pure oxygen. In general, the oxidation kinetics of BMG followed the single- or two-stage parabolic rate law at T ≤ 500 °C, with rate constants (Kp values) generally increased with temperature. Conversely, three-stage parabolic kinetics were observed for BMG at T ≥ 550 °C, with Kp values decreased with increasing temperature. The oxidation rate constants for the BMG alloy are slightly higher than those for crystalline alloy at T ≤ 500 °C. In addition, Kp values of BMG were nearly independent of partial pressure of oxygen, implying a typical scaling behavior with a n-type semiconductivity. The scales formed on the BMG is temperature-dependent, consisting mainly of tetragonal-ZrO2 (t-ZrO2) and minor amounts of Al2O3 at T ≤ 475 °C. At higher temperatures (T ≥ 500 °C), some monoclinic-ZrO2 (m-ZrO2) were also detected, and its amounts increased with increasing temperature. The BMG substrate began to form the crystalline Zr2Ni, Zr2Al, and ZrNiAl phases beneath the scales after oxidation at T ≥ 450 °C.

Research Area(s)

  • B. Glasses, metallic, B. Oxidation, B. Phase transformations

Bibliographic Note

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Citation Format(s)

Oxidation behavior of an Zr53Ni23.5Al23.5 bulk metallic glass at 400-600 °C. / Kai, W.; Hsieh, H. H.; Chen, Y. R.; Wang, Y. F.; Dong, C.

In: Intermetallics, Vol. 15, No. 11, 11.2007, p. 1459-1465.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review