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Propagation of shear bands in a Cu47.5Zr47.5Al5 bulk metallic glass

Published online by Cambridge University Press:  31 January 2011

K.B. Kim ,
J. Das ,
M.H. Lee ,
S. Yi ,
E. Fleury ,
Z.F. Zhang ,
W.H. Wang  and
J. Eckert
K.B. Kim*
Affiliation:
Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Gwangjin-gu, Seoul 143-747, Korea
J. Das
Affiliation:
Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Institute for Complex Materials, Dresden D-01171, Germany
M.H. Lee
Affiliation:
Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Institute for Complex Materials, Dresden D-01171, Germany
S. Yi
Affiliation:
Department of Materials Sciences and Metallurgy, Kyungpook National University, Buk-gu, Daegu 702-701, Korea
E. Fleury
Affiliation:
Advanced Metals Research Center, Korea Institute of Sciences and Technology, Cheongryang, Seoul 130-650, South Korea
Z.F. Zhang
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
W.H. Wang
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
J. Eckert
Affiliation:
Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Institute for Complex Materials, Dresden D-01171, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

We report a novel finding of slither propagation of shear bands on the fracture surface of a Cu47.5Zr47.5Al5 bulk metallic glass (BMG). The nanoscale heterogeneities in the as-cast state are aggregated along shear bands with irregular morphology. Such heterogeneities create a fluctuating stress field during shear band propagation leading to a slither propagation mode. The slither propagation of 10 to 15 nm wide shear bands is effective to improve both the plasticity and the “work-hardening-like” behavior of BMGs if the size, the morphology, and the elastic properties of the heterogeneities are intimately intercalated during solidification.

Keywords

AmorphousNanoscaleMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 1 , January 2008 , pp. 6 - 12
Copyright
Copyright © Materials Research Society 2008

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References

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