Johnson, W. L. and Samwer, K. (2005) A Universal Criterion for Plastic Yielding of Metallic Glasses with a (T/Tg)2/3 Temperature Dependence. Physical Review Letters, 95 (19). Art. no. 195501. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:JOHprl05
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Room temperature (TR) elastic constants and compressive yield strengths of ~30 metallic glasses reveal an average shear limit gammaC=0.0267±0.0020, where tauY=gammaCG 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 gammaC 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).
|Additional Information:||©2005 The American Physical Society (Received 25 January 2005; published 3 November 2005) W. L. J. acknowledges the Defence Advanced Research Projects Agency (DARPA-DSO), ARO Grant No. DAAD19-01-1-0525 and the National Science Foundation for providing support under the Caltech MRSEC program. K. S. acknowledges the support of the DFG under Grant No. SFB602 and the Leibniz Program.|
|Subject Keywords:||metallic glasses; plastic flow; shear modulus; elastic constants|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||12 Jan 2006|
|Last Modified:||26 Dec 2012 08:44|
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