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Oxidation-induced copper segregation in Cu60Zr30Ti10 bulk metallic glass

Published online by Cambridge University Press:  01 April 2006

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

Copper segregation in a subsurface layer during annealing of Cu60Zr30Ti10 bulk metallic glass at 773 K under oxygen atmosphere has been investigated by x-ray diffraction, Auger electron spectroscopy, x-ray photoelectron spectroscopy, and scanning electron microscopy. The formation of metallic copper is strongly dependent on the annealing environment. Various oxides with metallic copper are formed after annealing in oxygen atmosphere, but only crystalline intermetallic phases are found under vacuum annealing. Besides, surface characterization results show that the sample annealed in oxygen and vacuum result in enrichment and depletion of Cu on the surface region, respectively.

Keywords

AmorphousOxidationMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 4 , April 2006 , pp. 851 - 855
Copyright
Copyright © Materials Research Society 2006

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