The effect of thermal history on structure and mechanical properties of Cu64Zr36 metallic glass
The effect of thermal history on structure and mechanical properties of Cu64Zr36 metallic glass
复制标题
DOI：
10.1016/j.jnoncrysol.2019.119742
复制
发表时间：
2020-01-15
影响因子：
3.5
通讯作者：
Liang, Xiubing
中科院分区：
文献类型：
--
作者：
Mo, Jinyong;Shen, Baolong;Liang, Xiubing
众所周知，热历史可以影响局部原子结构，从而可能影响金属玻璃（MG）的力学性能。尽管在热历史的相当大的努力，其对微观结构的影响仍然存在争议，在目前的时间。在这项工作中，冷却速度和液体温度的微观结构和力学性能的综合影响进行了系统的分子动力学模拟研究。随着冷却速率的降低，具有较高局部五重对称性的多面体数量大大增加，从而提高了极限抗压强度。然而，液体温度对MG形成的影响可以忽略不计，这主要是由于采用了相对较高的冷却速率。这一工作将有助于加深我们对热形成历史对镁合金形成的影响的理解，并为改善镁合金的力学性能提供一个有前途的途径。
It is well known that the thermal history can affect the local atomic structure and thus may possibly affect the mechanical properties of metallic glasses (MGs). In spite of considerable efforts on the thermal history, its effect on the microstructure remains controversial at the present time. In this work, the combined effect of cooling rate and liquid temperature on the microstructure and mechanical properties are systematically investigated by molecular dynamics simulations. With the decrease of cooling rate, the polyhedrons with higher local five-fold symmetry is greatly enhanced, and thereby the ultimate compressive strength is increased. However, the effect of liquid temperature on the formation of MGs is negligible, mainly due to the relatively high cooling rates adopted. This work may increase our understanding in the effect of thermal formation history on the formation of MGs and provide a promising avenue for improving the mechanical properties.