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A Universal Criterion for Plastic Yielding of Metallic Glasses with a (T/Tg)2/3 Temperature Dependence

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.

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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).

Item Type:Article
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
Record Number:CaltechAUTHORS:JOHprl05
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1358
Deposited By: Archive Administrator
Deposited On:12 Jan 2006
Last Modified:18 Sep 2014 18:11

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