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Serrated flow behavior induced by blunt mechanism of shear crack propagation in metallic glass

Published online by Cambridge University Press:  26 July 2012

J.T. Fan ,
Z.F. Zhang ,
S.X. Mao ,
B.L. Shen  and
J. Eckert
Z.F. Zhang*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People's Republic of China
S.X. Mao
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People's Republic of China; and Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
J. Eckert
Affiliation:
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, People's Republic of China
*
a) Address all correspondence to these authors: e-mail: [email protected]
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Abstract

We present a blunt mechanism to explain the serrated flow behavior and slight “work hardening” at the beginning of yielding during the compression of metallic glass, which is in line with the piling-up of parallel shear bands on the fracture surface with a gradually increasing space from the edge of surface to inside. Meanwhile, two intrinsic parameters, i.e., strength intensity of blunt behavior, , and global work-hardening sensitivity exponent, , are introduced to characterize the blunt effect on the net increase in flow stress or work-hardening behavior of metallic glass.

Keywords

AmorphousFractureToughness
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 2 , February 2009 , pp. 436 - 440
Copyright
Copyright © Materials Research Society 2009

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References

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