Journal
SCRIPTA MATERIALIA
Volume 187, Issue -, Pages 323-328Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.06.049
Keywords
Metallic nanolayered composites; Molecular dynamics simulation; Shear localization; Size effect
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Funding
- NSF [CMMI-1652662]
- U.S. Department of Energy's NNSA [89233218CNA000001]
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We performed molecular dynamics simulations to study the effect of the layer thickness on the shear localization in Cu/Nb metallic nanolayered composites (MNCs). Our simulation results achieve good agreement with experimental results that the inverse size effect in the strength occurs in samples with layer thickness below 2.0 nm. The strain softening observed in those samples was triggered by the shear localization. The quantitative analysis revealed that the unsymmetrical dislocation transmission across the interface induces the shear localization and promotes the shear band formation in Cu/Nb MNCs. The plastic strain mainly comes from the interface sliding within the shear band. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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