Journal
SCRIPTA MATERIALIA
Volume 178, Issue -, Pages 57-61Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.11.006
Keywords
Metallic glasses; Shear band formation; Shear transformation zones; Molecular dynamics simulations; Plasticity
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG) [SO 1518/1-1]
- European Research Council under the ERC Advanced Grant INTEL-HYB [ERC-2013-ADG-340025]
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Using molecular dynamics simulations, we provide an atomistic description of the shear band multiplication mechanisms in a heterogeneous metallic glass consisting of two distinct amorphous regions with different amounts of free volume and degrees of short-range order. The structural differences and elastic fluctuations encountered by the developing shear band while crossing the interface between the two regions alter the autocatalytic activation of the shear transformation zones (STZs) and, subsequently, lead to shear band branching. The two-unit STZ-vortex mechanism sheds light on the correlation between the strain distribution during tensile deformation and the directional characteristics of the STZ activation process. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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