Unusual dislocation behavior in high-entropy alloys
Unusual dislocation behavior in high-entropy alloys
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DOI：
10.1016/j.scriptamat.2020.02.021
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发表时间：
2020-05-01
影响因子：
6
通讯作者：
Ma, Evan
中科院分区：
文献类型：
--
作者：
Ma, Evan
这篇观点文章阐述了与高熵合金（HEAs）中的位错及其滑移过程相关的十个不寻常的特征。注意力将被引导到组成波动几乎不可避免地在这些高浓度的解决方案，即使合金是一个单相和名义上随机的解决方案。这种不均匀性通常会因晶格畸变和多个主要元素之间相互作用产生的局部化学顺序而加剧。因此，位错运动面临着一个崎岖的原子和能量景观，提出了新的曲折的缺陷能量和性能，以及鸡尾酒强化作为一种新的形式的固溶体硬化超出了传统的机制。从这个角度来看，我们的系统性说明可能有助于回答社区中持续的疑问，即这些HEAs的特殊之处在于它们与传统的固溶体不同。(C)2020 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
This Viewpoint article articulates ten unusual features associated with dislocations and their slip processes in high-entropy alloys (HEAs). Attention will be directed towards the composition undulation almost inevitable in these highly concentrated solutions, even when the alloy is a single-phase and nominally random solution. This inhomogeneity is often exacerbated by lattice distortion and local chemical order arising from the interaction among multiple principal elements. As a consequence, dislocation motion faces a rugged atomic and energy landscape, presenting new twists in defect energetics and properties, as well as cocktail strengthening as a new form of solid solution hardening beyond the conventional mechanism. Our systematic account from this standpoint may help answer the continual query in the community as to what is special about these HEAs that makes them different from traditional solid solutions. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.