Structural evolution of nanoscale metallic glasses during high-pressure torsion: A molecular dynamics analysis.
Structural evolution of nanoscale metallic glasses during high-pressure torsion: A molecular dynamics analysis.
复制标题
纳米级金属玻璃在高压扭转过程中的结构演化：分子动力学分析
DOI：
10.1038/srep36627
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发表时间：
2016-11-07
影响因子：
4.6
通讯作者：
Liu RP
中科院分区：
文献类型：
--
作者：
Feng SD;Jiao W;Jing Q;Qi L;Pan SP;Li G;Ma MZ;Wang WH;Liu RP
采用分子动力学模拟方法研究了纳米cu50zr50金属玻璃在高压扭转过程中的结构演变。结果表明，在室温下，高压扭转可以实现纳米cu50zr50金属玻璃的剪切转变的强协同。进一步表明，高压扭转可以促使原子具有更低的五倍对称性和更高的势能，使它们更有可能参与剪切转变。同时，扭转周期越长，强制合作流的程度越大。高压扭转作用下明显的室温强制协同流动为研究剪切转变、剪切转变的激活和特征以及剪切转变与变形行为的关系提供了条件。这项研究不仅为探索金属玻璃中高压扭转的基本机制提供了一个重要的原子水平的理解平台，而且还导致了以前不可能的更高的应力和近低温的均匀流动。
Structural evolution in nanoscale Cu50Zr50metallic glasses during high-pressure torsion is investigated using molecular dynamics simulations. Results show that the strong cooperation of shear transformations can be realized by high-pressure torsion in nanoscale Cu50Zr50metallic glasses at room temperature. It is further shown that high-pressure torsion could prompt atoms to possess lower five-fold symmetries and higher potential energies, making them more likely to participate in shear transformations. Meanwhile, a higher torsion period leads to a greater degree of forced cooperative flow. And the pronounced forced cooperative flow at room temperature under high-pressure torsion permits the study of the shear transformation, its activation and characteristics, and its relationship to the deformations behaviors. This research not only provides an important platform for probing the atomic-level understanding of the fundamental mechanisms of high-pressure torsion in metallic glasses, but also leads to higher stresses and homogeneous flow near lower temperatures which is impossible previously.
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