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Initiation and evolution of shear bands in bulk metallic glass under tension—An in situ scanning electron microscopy observation

Published online by Cambridge University Press:  31 January 2011

Qingping Cao ,
Feng Xu ,
Jingwei Liu ,
Lianyi Chen ,
Xiaodong Wang ,
Jianzhong Jiang ,
Alexander Minkow ,
Kejing Yang ,
H.J. Fecht  and
Julia Ivanisenko
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Qingping Cao*
Affiliation:
International Center for New-Structured Materials (ICNSM), Zhejiang University and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
Jianzhong Jiang*
Affiliation:
International Center for New-Structured Materials (ICNSM), Zhejiang University and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
H.J. Fecht
Affiliation:
Materials Division, Faculty of Engineering, University of Ulm, D-89081 Ulm, Germany
Julia Ivanisenko
Affiliation:
Forschungszentrum Karlsruhe, Institut für Nanotechnologie, 76021 Karlsruhe, Germany
Shaoxing Qu
Affiliation:
International Center for New-Structured Materials (ICNSM), Zhejiang University, Hangzhou 310027, People’s Republic of China; and Institute of Applied Mechanics, School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, People’s Republic of China
*
Address all correspondence to these authors: a) e-mail: caoqp@zju.edu.cn
b) e-mail: jiangjz@zju.edu.cn
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Abstract

The initiation and evolution of shear bands in Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass tensile samples has been investigated in situ by scanning electron microscopy. The initial shear band originates from the highest stressed area, and does not propagate during further tension, which is attributed to the weakening of the stress field in front of the shear band tip, possibly caused by atomic rearrangement and local temperature rise. As a result, multiple shear bands occur in sequence with gradually increased length and offset. This result is due to the fact that the stress in front of the tip of the initial shear band does not concentrate again during further tension above the shear yield strength. Numerical analysis was carried out to investigate the stress distribution under tension, suggesting that the maximum pressure-dependent shear stress criterion overestimates the yield strength, while the shear plane criterion describes the conditions for the formation of shear bands well.

Keywords

AmorphousScanning electron microscopy (SEM)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 9 , September 2009 , pp. 2924 - 2930
Copyright
Copyright © Materials Research Society 2009

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