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Prediction of shear-band thickness in metallic glasses

Authors
Journal
Scripta Materialia
1359-6462
Publisher
Elsevier
Publication Date
Volume
60
Issue
11
Identifiers
DOI: 10.1016/j.scriptamat.2009.02.039
Keywords
  • Metallic Glasses
  • Shear Band
  • Shear Transformation Zone
  • Free Volume
Disciplines
  • Mathematics

Abstract

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.

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