金属玻璃在不同温度下应力晶化行为的分子动力学模拟研究

金属玻璃的晶化对提高其力学性能尤其是延展性有重要意义．除了温度效应，大量文献证实应力是导致晶化的重要原因．本文通过分子动力学模拟，研究了金属玻璃铜在温度和应力两种因素联合作用下的晶化行为，分别研究了温度和应力两种因素的贡献．结果表明晶化比例随温度和应变的增大而增大，应变硬化与晶化比例之间存在正相关关系，证实了金属玻璃的应变硬化一定程度上由晶化引起．

Molecular Dynamics Simulations of Stress Driven Crystallization of Metallic Glass under Different Temperatures

Crystallization of metal glass is an important approach to improve the ductility of these brittle materials. Besides the thermal effect, a number of researches verified that the stress is another factor causing crystallization. In this work, the crystallization behaviour of glassy copper under different temperatures and stresses is investigated via molecular dynamics simulations. The separate contributions of temperature and stress are determined. The results show that the crystallization ratio increases with the increase of either temperature or stress. The strain hardening is positively related to the crystallization ratio, indicating that the strain hardening is caused by the crystallization to some extent.