In this paper, tensile deformation of metallic glass (MG) nanocomposites which consist of cellular MG matrix and columnar grains are studied by the molecular dynamic simulations. The size effects of the ligament thickness and the grain size on the yield strength and plasticity are elucidated. It is found that the ratio of the grain size to the ligament thickness ( d / s ) has a great influence on the plastic deformation. Two typical deformation mechanisms are further investigated. In the composite models with large d / s , grain boundaries motion and voids formation are the main mechanisms. When d / s decreases to 6, the grains can not only promote multiple shear bands formation but also impede the main shear band propagation. As a result, large plastic plateau appears in the stress–strain curve. These results are helpful to optimize the mechanical properties of MG composites.

中文翻译：

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金属玻璃纳米复合材料力学性能的原子学研究

本文通过分子动力学模拟研究了由蜂窝状MG基体和圆柱状晶粒组成的金属玻璃（MG）纳米复合材料的拉伸变形。阐明了韧带厚度和晶粒尺寸对屈服强度和塑性的尺寸影响。发现晶粒尺寸与韧带厚度的比率（d / s）对塑性变形具有很大的影响。进一步研究了两种典型的变形机理。在大d / s的复合模型中，晶界运动和空洞形成是主要机制。当d / s减小到6时，晶粒不仅会促进多个剪切带的形成，而且会阻碍主剪切带的传播。结果，在应力-应变曲线中出现了较大的塑料平台。