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Atomic-scale origin of shear band multiplication in heterogeneous metallic glasses

Sopu, D. and Scudino, S. and Bian, X. L. and Gammer, C. and Eckert, J. (2019):
Atomic-scale origin of shear band multiplication in heterogeneous metallic glasses.
In: Scripta Materialia, 1782020. Elsevier Ltd., pp. 57-61, ISSN 13596462,
DOI: 10.1016/j.scriptamat.2019.11.006,
[Online-Edition: https://doi.org/10.1016/j.scriptamat.2019.11.006],
[Article]

Abstract

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.

Item Type: Article
Erschienen: 2019
Creators: Sopu, D. and Scudino, S. and Bian, X. L. and Gammer, C. and Eckert, J.
Title: Atomic-scale origin of shear band multiplication in heterogeneous metallic glasses
Language: English
Abstract:

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.

Journal or Publication Title: Scripta Materialia
Volume: 178
Publisher: Elsevier Ltd.
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Date Deposited: 28 Jan 2020 07:29
DOI: 10.1016/j.scriptamat.2019.11.006
Official URL: https://doi.org/10.1016/j.scriptamat.2019.11.006
Projects: SO 1518/1-1 (DFG)
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