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Title: An instability index of shear band for plasticity in metallic glasses
Authors: Han, Z.
Wu, W.F.
Li, Y. 
Wei, Y.J.
Gao, H.J.
Keywords: Machine stiffness
Metallic glasses
Shear-band instability index
Size effect
Issue Date: Mar-2009
Citation: Han, Z., Wu, W.F., Li, Y., Wei, Y.J., Gao, H.J. (2009-03). An instability index of shear band for plasticity in metallic glasses. Acta Materialia 57 (5) : 1367-1372. ScholarBank@NUS Repository.
Abstract: Catastrophic failure along a dominant shear band sets the limit on how much plasticity can be achieved in metallic glasses (MGs) under uniaxial compression. Here we show that this instability process is governed by a single system parameter, called the shear-band instability index (SBI), which is proportional to sample size and inversely proportional to machine stiffness. We provide extensive experimental proof of this concept by conducting a series of tests with a range of controlled values of sample size and machine stiffness. The theory of SBI has led us to a more comprehensive understanding of the mechanisms of plastic deformation in MGs via simultaneous operation of multiple shear bands versus a single dominant one. This concept provides a theoretical basis to design systems which promote plasticity/ductility in MGs by suppressing or delaying shear-band instability. © 2008 Acta Materialia Inc.
Source Title: Acta Materialia
ISSN: 13596454
DOI: 10.1016/j.actamat.2008.11.018
Appears in Collections:Staff Publications

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