Prediction of shear-band thickness in metallic glasses
M.Q. Jiang,^a W.H. Wang^b and L.H. Dai^a,*
aState Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190,
People’s Republic of China
bInstitute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
Received 20 November 2008; revised 31 January 2009; accepted 20 February 2009
Available online 27 February 2009

We derive an explicit expression for predicting the thicknesses of shear bands in metallic glasses. The model demonstrates that the shear-band thickness is mainly dominated by the activation size of the shear transformation zone (STZ) and its activation free volume concentration. The predicted thicknesses agree well with the results of measurements and simulations. The underlying physics is attributed to the local topological instability of the activated STZ. The result is of significance in understanding the origin of inhomogeneous flow in metallic glasses.

2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keywords: Metallic glasses; Shear band; Shear transformation zone; Free volume

Figure 3. Prediction of shear-band thickness W. (a) Dependence of Poisson’s ratio m and activation free volume concentration n* on W for fixed STZ size d = 1.5 nm. (b) Dependence of n* and d on W for fixed m = 0.36.

相关工作发表在 Scripta Materialia 60 (2009) 1004–1007

M.Q. Jiang-SMM-2009

 

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