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Indentation creep of a Ti-based metallic glass

Published online by Cambridge University Press:  31 January 2011

Y.J. Huang
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; and Department of Chemical and Materials Engineering, University of Auckland, Auckland 1142, New Zealand
Y.L. Chiu*
Affiliation:
Department of Chemical and Materials Engineering, University of Auckland, Auckland 1142, New Zealand; and Department of Metallurgy and Materials, University of Birmingham, Edgbaston B15 2TT, United Kingdom
J. Shen*
Affiliation:
School of Materials Science and Engineering and Micro/Nano Technology Research Center, Harbin Institute of Technology, Harbin 150001, China
J.J.J. Chen
Affiliation:
Department of Chemical and Materials Engineering, University of Auckland, Auckland 1142, New Zealand
J.F. Sun
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
*
a) Address all correspondence to these authors. e-mail: [email protected]
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Abstract

In this work, the time-dependent plastic deformation behavior of Ti40Zr25Ni3Cu12Be20 bulk and ribbon metallic glass alloys was investigated using a nanoindentation technique at room temperature with the applied load ranging from 5 to 100 mN. The stress exponent n, defined as, has been derived as a measure of the creep resistance. It was found that the measured stress exponent increases rapidly with increasing indentation size, exhibiting a positive size effect. The size effect on the stress exponent n obtained from the bulk sample is more pronounced than that obtained from the ribbon sample. The deformation mechanism involved will be discussed.

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Articles
Copyright
Copyright © Materials Research Society 2009

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References

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