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Revelation of the effect of structural heterogeneity on microplasticity in bulk metallic-glasses

Published online by Cambridge University Press:  31 January 2011

Yong Yang ,
Jianchao Ye ,
Jian Lu ,
Qing Wang  and
Peter K. Liaw
Jian Lu
Affiliation:
The Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China
Qing Wang
Affiliation:
The Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China; and The Institute of Materials Science, The University of Shanghai, 200072 Shanghai, People's Republic of China
Peter K. Liaw
Affiliation:
The Department of Material Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200
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Abstract

In this article, the shear-banding behavior in bulk metallic-glasses (BMGs) is studied using a focused ion beam (FIB)-based nanoindentation method, which involves cylindrical nanoindentation of a FIB-milled BMG microlamella and is capable of revealing the subsurface shear-band patterns down to the submicron scale. The results of the current study on a Zr-based BMG clearly show that short shear bands, with the lengths of a few hundred nanometers, could be severely kinked before growing into a longer one, which implies that structural heterogeneity plays an important role in the microplasticity of BMGs. Furthermore, through the three-dimensional finite-element simulation combined with the theoretical calculation based on the Mohr–Coulomb law, it is found that the yield strengths exhibit a large scatter as a consequence of the structural heterogeneity when microplasticity occurs in the Zr-based BMG, which is consistent with our recent findings obtained from the microcompression experiments.

Keywords

AmorphousMetalNano-indentation
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 3 , March 2010 , pp. 563 - 575
Copyright
Copyright © Materials Research Society 2010

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