材料科学
成核
无定形固体
剪切(物理)
复合材料
位错
剪切(地质)
变形(气象学)
非晶态金属
凝聚态物理
结晶学
合金
热力学
化学
物理
作者
Zhe Yan,Zhaorui Liu,B.N. Yao,Qi An,Ruifeng Zhang,Shijian Zheng
标识
DOI:10.1016/j.scriptamat.2023.115470
摘要
Interface-induced dislocation nucleation and interface sliding are two decisive mechanisms to understand plastic deformation of nanolayered composites. Taking the Cu-Nb system as a prototype, with atomic simulations, we reveal the atomic mechanism of dislocation nucleation and interface sliding after introducing the CuNb amorphous complexions with different compositions. Under tension loading, the initial nucleation sites correspond to the localized shearing region, and the amorphous composition can regulate the ordering degree of crystalline/amorphous interfaces. Under shear loading, the pathway of interface sliding corresponds to the low-energy region of the energetic landscape, and the shear resistance increases with the increase of Cu content owing to the enhancement of the sliding barrier. These findings reveal the influence of the amorphous complexions on plastic deformation, and provide theoretical guidance for the design of nanolayered composites.
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