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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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138-78 Keck Laboratory of Engineering, California Institute of Technology, Pasadena, California 91125, USA.


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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