Oxidation behavior of a Zr-Cu-Al-Ni amorphous alloy in air at 300-425 °C

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

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)1265-1270
Journal / PublicationIntermetallics
Volume10
Issue number11-12
Publication statusPublished - Nov 2002
Externally publishedYes

Abstract

The oxidation behavior of Zr-30Cu-10Al-5Ni bulk metallic glass and its crystalline counterpart was studied over the temperature range of 300-425 °C in dry air. In general, the oxidation kinetics of both amorphous and crystalline alloys followed a two- or three-stage parabolic rate law at T≥350 °C, while at 300 °C the amorphous alloy oxidized following a linear behavior. The oxidation rate constants for the amorphous alloy are slightly higher than those for the crystalline alloy at 350-400 °C. The scale formed on the amorphous alloy consists of mainly tetragonal-ZrO2 at 300 °C, while a mixture of monoclinic-ZrO2 (m-ZrO2) and tetragonal-ZrO2 (t-ZrO2) and some CuO were detected at higher temperatures. The scale formed on the crystalline alloy, on the other hand, consists of mainly Al2O3, some tetragonal-ZrO2, and a slight amount of monoclinic-ZrO2 at 300 °C. At higher temperatures, the crystalline alloy consists of mainly monoclinic-ZrO2, some CuO and Cu2O, and limited tetragonal-ZrO2. It is suggested that the formation of Al2O3 (at 300 °C) and CuO/Cu2O (at 350-400 °C) on the crystalline alloy is responsible for the reduced oxidation rates as compared with those of amorphous alloy. © 2002 Elsevier Science Ltd. All rights reserved.

Research Area(s)

  • B. Oxidation, Diffusion

Bibliographic Note

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Citation Format(s)

Oxidation behavior of a Zr-Cu-Al-Ni amorphous alloy in air at 300-425 °C. / Kai, W.; Hsieh, H. H.; Nieh, T. G.; Kawamura, Y.

In: Intermetallics, Vol. 10, No. 11-12, 11.2002, p. 1265-1270.

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