Atomic dynamics under oscillatory shear in metallic glasses

Atomic dynamics under oscillatory shear in metallic glasses
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金属玻璃振荡剪切下的原子动力学

DOI:
10.1016/j.jnoncrysol.2020.120069
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发表时间:
2020-07
影响因子:
3.5
通讯作者:
Hailong Peng
Hailong Peng
中科院分区:
材料科学2区
文献类型:
--
作者:
Hongkuan Li;Huashan Liu;Hailong Peng

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采用经典分子动力学模拟方法,研究了CuZr金属玻璃在振荡剪切作用下淬火条件对时效和复壮效果的影响。这一过程背后的原子动力学是重点。在非平衡态,我们发现了快原子和慢原子的分离,快原子对位移分布函数的贡献具有指数尾部,与玻璃形成液体中的尾部相似。然而,我们没有观察到任何局域弛豫过程,例如笼子的相对运动,这在过冷液体中是显著的。与液体中的拉伸指数律相反,流态化玻璃中的结构弛豫呈现简单的指数衰减。这一动力学意义归因于剪切非晶态固体中原子位移的次延展特征。
The influence of quenching condition on the aging and the rejuvenation effect was investigated by classical molecular-dynamics simulations on CuZr metallic glasses under oscillatory shear. Atomic dynamics underlying this procedure is focused. We found a separation of fast and slow atoms in the non-equilibrium state, with an exponential tail in the displacement distribution function contributed by the fast atoms, similar to that in the glass-forming liquids. However, we do not observe any localized relaxation process, e.g., the cage relative motion, which is prominent in the supercooled liquids. Structural relaxation in the fluidized glasses exhibits a simple exponential decay, in contrast to the stretched exponential law in liquids. This dynamic significance is ascribed to the subextensive feature of the atomic displacement in the sheared amorphous solids.
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