Thickness-dependent shear localization in Cu/Nb metallic nanolayered composites
Thickness-dependent shear localization in Cu/Nb metallic nanolayered composites
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DOI：
10.1016/j.scriptamat.2020.06.049
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发表时间：
2020-10
影响因子：
6
通讯作者：
S. Dong;Tianju Chen;Sixie Huang;Nan Li;Caizhi Zhou
中科院分区：
文献类型：
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作者：
S. Dong;Tianju Chen;Sixie Huang;Nan Li;Caizhi Zhou
我们进行了分子动力学模拟，以研究层厚度对 Cu/Nb 金属纳米层复合材料 (MNC) 中剪切局部化的影响。我们的模拟结果与实验结果非常吻合，即层厚度低于 2.0 nm 的样品中出现强度的反尺寸效应。在这些样品中观察到的应变软化是由剪切局部化触发的。定量分析表明，界面上的不对称位错传输会引起剪切局域化，并促进 Cu/Nb MNC 中剪切带的形成。塑性应变主要来自剪切带内的界面滑动。
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.