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剪切转变区分析金属玻璃的弛豫弹性揭示了α和β弛豫的不同性质。

Shear transformation zone analysis of anelastic relaxation of a metallic glass reveals distinct properties of α and β relaxations.

机构信息

Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

出版信息

Phys Rev E. 2019 Sep;100(3-1):033001. doi: 10.1103/PhysRevE.100.033001.

Abstract

Metallic glasses with pronounced high-frequency β relaxation in their dynamic-mechanical response have been observed to exhibit large plasticity. Due to their disordered atomic structure, it is challenging to identify the microscopic mechanisms of their relaxation behavior. Quasistatic anelastic relaxation measurements have been performed over 10 orders of magnitude of time on La_{55}Ni_{20}Al_{25} metallic glass, which exhibits a strong β relaxation. The corresponding time-constant spectra were computed from the data-they contain a series of peaks corresponding to an atomically quantized hierarchy of shear transformation zones (STZs), where both the α and β relaxations are consistent with the STZ model. Two different regimes of activation-volume increment between the peaks are observed, suggesting the involvement of different elements in STZs corresponding to α vs β relaxations. Room-temperature structural relaxation significantly affects the former but not the latter.

摘要

在动态力学响应中表现出明显高频β弛豫的金属玻璃表现出较大的塑性。由于其无序的原子结构,很难确定其弛豫行为的微观机制。对具有强烈β弛豫的 La_{55}Ni_{20}Al_{25}金属玻璃进行了超过 10 个数量级时间的准静态粘弹性弛豫测量。从数据中计算出相应的时变常数谱——它们包含一系列与原子量化的剪切转变区(STZ)层次结构相对应的峰值,其中α和β弛豫都与 STZ 模型一致。在峰之间观察到两种不同的激活体积增量模式,这表明不同元素参与了对应于α和β弛豫的 STZ。室温结构弛豫显著影响前者,但不影响后者。

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