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Oxidation Behavior of Cu60Zr30Ti10 Bulk Metallic Glass

Published online by Cambridge University Press:  01 June 2005

C.Y. Tam  and
C.H. Shek
C.Y. Tam
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon Tong, Hong Kong
C.H. Shek*
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon Tong, Hong Kong
*
a) Address all correspondence to this author. e-mail: apchshek@cityu.edu.hk
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Abstract

The oxidation kinetics of Cu60Zr30Ti10 bulk metallic glass and its crystalline counterpart were studied in oxygen environment over the temperature range of 573–773 K. The oxidation kinetics, measured with thermogravimetric analysis, of the metallic glass follows a linear rate law between 573 and 653 K and a parabolic rate law between 673 and 733 K. It was also found that the oxidation activation energy of metallic glass is lower than that of its crystalline counterpart. The x-ray diffraction pattern showed that the oxide layer is composed of Cu2O, CuO, ZrO2, and metallic Cu. Cu enrichment on the topmost oxide layer of the metallic glass oxidized at 573 K was revealed by x-ray photoelectron spectroscopy while there was a decrease in Cu content in the innermost oxide layer. The oxide surface morphologies observed from scanning electron microscopy showed that ZrO2 granules formed at low temperatures while whiskerlike copper oxides formed at higher temperatures.

Keywords

AmorphousOxidation/annealingX-ray photoelectron spectroscopy (XPS)
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 6 , June 2005 , pp. 1396 - 1403
Copyright
Copyright © Materials Research Society 2005

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