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Structural heterogeneities and mechanical behavior of amorphous alloys
Progress in Materials Science ( IF 33.6 ) Pub Date : 2019-07-01 , DOI: 10.1016/j.pmatsci.2019.04.005
J.C. Qiao , Q. Wang , J.M. Pelletier , H. Kato , R. Casalini , D. Crespo , E. Pineda , Y. Yao , Y. Yang

Abstract Although the atomic structure of amorphous alloys, which lacks long-range translational symmetry, may appear homogeneous at the macroscopic scale, their local dynamic and/or static properties however vary significantly according to the recent experimental and simulation results. In the literature of amorphous alloys, the nature of such local heterogeneities is currently an issue under debate. More importantly, since amorphous alloys are in a thermodynamically nonequilibrium state, their local structures constantly evolve during structural relaxation, physical aging and mechanical deformation. As such, local structural heterogeneities, which vary with the thermal and mechanical history of amorphous alloys, could provide a key to understand the structural origin of their mechanical behavior, such as anelasticity, viscoelasticity, plasticity and fracture. In this review article, we first review mechanical spectroscopy or dynamic mechanical analyses as an important tool to study the relaxation dynamics in amorphous alloys, with a focus on the possible correlation between the secondary (also called β) relaxation and the local structural heterogeneities of amorphous alloys. After that, we discuss the recent advances on the understanding of structural heterogeneities in metallic supercooled liquids and the influence of the structural heterogeneities on the overall mechanical properties of the corresponding amorphous alloys. Finally, we briefly discuss the further development of research on this subject.

中文翻译:

非晶合金的结构异质性和力学行为

摘要 尽管缺乏长程平移对称性的非晶合金的原子结构在宏观尺度上可能看起来是均质的,但根据最近的实验和模拟结果,它们的局部动态和/或静态特性差异很大。在非晶合金的文献中,这种局部异质性的性质目前是一个有争议的问题。更重要的是,由于非晶合金处于热力学非平衡状态,在结构松弛、物理时效和机械变形过程中,它们的局部结构不断演变。因此,局部结构异质性随非晶合金的热和机械历史而变化,可以为理解其力学行为的结构起源提供关键,例如非弹性、粘弹性、塑性和断裂。在这篇综述文章中,我们首先回顾了作为研究非晶合金弛豫动力学的重要工具的力学光谱或动态力学分析,重点是二次(也称为 β)弛豫与非晶合金的局部结构异质性之间可能的相关性。合金。之后,我们讨论了对金属过冷液体结构异质性的理解以及结构异质性对相应非晶合金整体机械性能的影响的最新进展。最后,我们简要讨论了该主题研究的进一步发展。我们首先回顾了作为研究非晶合金弛豫动力学的重要工具的力学光谱或动态力学分析,重点是二次(也称为 β)弛豫与非晶合金的局部结构异质性之间可能的相关性。之后,我们讨论了对金属过冷液体结构异质性的理解以及结构异质性对相应非晶合金整体机械性能的影响的最新进展。最后,我们简要讨论了该主题研究的进一步发展。我们首先回顾了作为研究非晶合金弛豫动力学的重要工具的力学光谱或动态力学分析,重点是二次(也称为 β)弛豫与非晶合金局部结构异质性之间可能的相关性。之后,我们讨论了对金属过冷液体结构异质性的理解以及结构异质性对相应非晶合金整体机械性能的影响的最新进展。最后,我们简要讨论了该主题研究的进一步发展。我们讨论了对金属过冷液体中结构异质性的理解以及结构异质性对相应非晶合金的整体机械性能的影响的最新进展。最后,我们简要讨论了该主题研究的进一步发展。我们讨论了对金属过冷液体中结构异质性的理解以及结构异质性对相应非晶合金的整体机械性能的影响的最新进展。最后,我们简要讨论了该主题研究的进一步发展。
更新日期:2019-07-01
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