Thickness-dependent shear localization in Cu/Nb metallic nanolayered composites

SCRIPTA MATERIALIA

卷:187

Article

Dong, Shujing¹  Chen, Tianju²  Huang, Sixie²  Li, Nan³  Zhou, Caizhi¹ 

[1] Univ South Carolina, Dept Mech Engn, Columbia, SC 29208 USA

[2] Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65409 USA

[3] Los Alamos Natl Lab, MPA CINT, Los Alamos, NM 87545 USA

关键词: Metallic nanolayered composites;    Molecular dynamics simulation;    Shear localization;    Size effect;   

DOI  :  10.1016/j.scriptamat.2020.06.049

来源: Elsevier

【 摘 要 】

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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