Theory of Pressure-Induced Rejuvenation and Strain Hardening in Metallic Glasses
Theory of Pressure-Induced Rejuvenation and Strain Hardening in Metallic Glasses
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金属玻璃的压力诱导再生和应变硬化理论
DOI：
10.1103/physrevlett.126.025502
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Katsunori Wakabayashi
中科院分区：
文献类型：
--
作者：
Anh D Phan;Alessio Zaccone;Vu D Lam;Katsunori Wakabayashi
我们从理论上研究了高压对金属玻璃原子动力学的影响。该理论预测了最近在金属玻璃中观察到的压缩诱导回春和由此产生的应变硬化。结构在压力作用下的松弛主要受局部笼形动力学控制。外部压力限制了动力学约束，降低了原子迁移率。此外，压缩在自由能场的高能量处诱导了一个重新恢复的亚稳态（局部最小值）。因此，压缩金属玻璃可以恢复活力，相应的松弛是可逆的。这种行为导致机械变形实验中的应变硬化。理论预测与实验吻合得很好。
We theoretically investigate high-pressure effects on the atomic dynamics of metallic glasses. The theory predicts compression-induced rejuvenation and the resulting strain hardening that have been recently observed in metallic glasses. Structural relaxation under pressure is mainly governed by local cage dynamics. The external pressure restricts the dynamical constraints and slows down the atomic mobility. In addition, the compression induces a rejuvenated metastable state (local minimum) at a higher energy in the free-energy landscape. Thus, compressed metallic glasses can rejuvenate and the corresponding relaxation is reversible. This behavior leads to strain hardening in mechanical deformation experiments. Theoretical predictions agree well with experiments.