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Phys Rev Lett. 2005 Nov 4;95(19):195501. Epub 2005 Nov 3.

A universal criterion for plastic yielding of metallic glasses with a (T/Tg) 2/3 temperature dependence.

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1
138-78 Keck Laboratory of Engineering, California Institute of Technology, Pasadena, California 91125, USA. wlj@caltech.edu

Abstract

Room temperature (TR) elastic constants and compressive yield strengths of approximately 30 metallic glasses reveal an average shear limit gammaC=0.0267+/-0.0020, where tauY=gamma CG is the maximum resolved shear stress at yielding, and G the shear modulus. The gammaC values for individual glasses are correlated with t=TR/Tg , and gamma C for a single glass follows the same correlation (vs t=T/Tg). A cooperative shear model, inspired by Frenkel's analysis of the shear strength of solids, is proposed. Using a scaling analysis leads to a universal law tauCT/G=gammaC0-gammaC1(t)2/3 for the flow stress at finite T where gammaC0=(0.036+/-0.002) and gammaC1=(0.016+/-0.002).

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