Impact of High Pressure on Reversible Structural Relaxation of Metallic Glass,Physica Status Solidi-Rapid Research Letters

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Impact of High Pressure on Reversible Structural Relaxation of Metallic Glass
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2021-05-28 , DOI: 10.1002/pssr.202100235
Nguyen K. Ngan ₁ , Anh D. Phan _{1,

2} , Alessio Zaccone _{3,

4,

5}

Affiliation

The temperature dependence of the reversible structural relaxation time and diffusion constant of metallic glasses under pressure is theoretically investigated. The compression not only changes the glassy dynamics, but also generates a metastable state along with a higher-energy state where the system can rejuvenate. The relaxation times for forward and backward transitions in this two-state system are nearly identical and much faster than the relaxation time without accounting for barrier recrossing. At ambient pressure, the expected irreversible relaxation process is recovered, and the numerical results agree well with prior experimental results. An increase in pressure has a minor effect on the relaxation time and diffusion constant that one computes without considering the influence of the metastable state, but it leads to a large reduction of the reversible relaxation time computed upon considering the metastable state. The presence of external compression is also shown to trigger a fragile-to-strong crossover in metallic glasses.

中文翻译：

高压对金属玻璃可逆结构松弛的影响

从理论上研究了金属玻璃在压力下的可逆结构弛豫时间和扩散常数的温度依赖性。压缩不仅会改变玻璃态动力学，还会产生亚稳态以及系统可以恢复活力的更高能量状态。在这个双态系统中向前和向后跃迁的弛豫时间几乎相同，并且比不考虑势垒重新交叉的弛豫时间快得多。在环境压力下，恢复了预期的不可逆松弛过程，数值结果与先前的实验结果吻合良好。压力的增加对弛豫时间和扩散常数的影响很小，这是在不考虑亚稳态影响的情况下计算的，但它导致在考虑亚稳态时计算的可逆弛豫时间大大减少。外部压缩的存在也被证明会触发金属玻璃中的脆到强交叉。

更新日期：2021-05-28

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