Atomistic investigation of mechanical properties of metallic glass nanocomposites

Atomistic investigation of mechanical properties of metallic glass nanocomposites
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金属玻璃纳米复合材料机械性能的原子研究

DOI:
10.1088/1361-651x/abbd2c
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发表时间:
2020-10
影响因子:
1.8
通讯作者:
CHANG QING CHEN
CHANG QING CHEN
中科院分区:
材料科学3区
文献类型:
--
作者:
Xiaoling Zhou;Longqi Wang;CHANG QING CHEN

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采用分子动力学模拟方法研究了由蜂窝状金属玻璃基体和柱状晶组成的纳米复合材料的拉伸变形行为。阐明了韧带厚度和晶粒尺寸对屈服强度和塑性的尺寸效应。结果表明,晶粒尺寸与韧带厚度之比(d/s)对塑性变形有很大影响。两个典型的变形机制进行了进一步研究。在大d/s的复合材料模型中,晶界运动和空洞的形成是主要的机制。当d/s减小到6时,晶粒不仅能促进多剪切带的形成,而且能阻碍主剪切带的扩展。结果表明,在应力-应变曲线上出现了较大的塑性平台。这些结果有助于优化MG复合材料的力学性能。
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.
DOI: 10.1016/j.scriptamat.2013.03.004
发表时间: 2013-07
期刊: Scripta Materialia
影响因子: 6
作者:
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通讯作者: Z. Y. Zhang;Yuan Wu;J. Zhou;H. Wang;Xiongjun Liu;Zhenwen Lu
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DOI: 10.1016/j.scriptamat.2009.10.024
发表时间: 2010-03-01
期刊: SCRIPTA MATERIALIA
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发表时间: 2013-05
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DOI: 10.1155/2013/517904
发表时间: 2013-01
期刊: Journal: Materials
影响因子: --
作者:
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通讯作者: D. Hofmann