论文标题
压力诱导的金属玻璃中的恢复活力和应变的理论
Theory of pressure-induced rejuvenation and strain-hardening in metallic glasses
论文作者
论文摘要
从理论上讲，我们研究了对金属玻璃原子动力学的高压作用。该理论预测了压缩诱导的恢复和最近在金属玻璃中观察到的应变硬化。压力下的结构放松主要由局部笼子动力学控制。外部压力限制了动态约束并减慢了原子迁移率。此外，压缩在自由能景观中以较高的能量诱导了复兴的亚稳态（局部最低）。因此，压缩金属玻璃可以恢复活力，相应的放松是可逆的。这种行为导致机械变形实验中的应变硬化。理论预测与实验非常吻合。
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.
