A review on the dynamic-mechanical behaviors of high-entropy alloys
A review on the dynamic-mechanical behaviors of high-entropy alloys
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DOI：
10.1016/j.pmatsci.2023.101090
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发表时间：
2023-02
影响因子：
37.4
通讯作者：
Yu-ling Tang;Ruixin Wang;Bin Xiao;Zhouran Zhang;Shun Li;J. Qiao;S. Bai;Yong Zhang;P. Liaw
中科院分区：
文献类型：
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作者：
Yu-ling Tang;Ruixin Wang;Bin Xiao;Zhouran Zhang;Shun Li;J. Qiao;S. Bai;Yong Zhang;P. Liaw
高熵合金（High-entropy alloys，HEAs）是一类新型的多主元合金，其主元元素的摩尔比大于4或接近4。独特的多主成分导致了高的构型熵或混合熵，以及一些独特的微观结构。因此，许多令人印象深刻的性能，包括卓越的动态力学性能，HEAs已陆续报道。在高应变率（ε今> 10 3 s− 1）瞬时加载条件下，材料的动态变形机制与静态变形机制不同，影响因素复杂。为了揭示HEAs独特的微观结构与其动态力学性能之间的关系，本文综述了2015年7月至2023年1月期间发表的76篇文章。首先，对已报道的61种高性能铝合金的制备工艺、实验方法、理论模型、相组成、微观结构以及动态力学性能进行了系统的统计和分类。其次，对理论模型和变形机理进行了总结。详细讨论了位错运动、孪晶和相变行为对HEAs动态变形的影响。文中还考虑了绝热剪切行为及其对动力变形的影响。阐述了高性能铝合金与传统金属材料在动态力学行为上的差异及其相关机理。最后，充分展示了HEAs在动态载荷下的潜在应用。本文还讨论了动态力学行为的未来研究方向，以开发新型高性能HEAs。
High-entropy alloys (HEAs) are a family of novel multi-principal alloys containing> 4 principal elements in equimolar ratios or nearly-equimolar ratios. The unique multiple-principal components bring in the high configurational entropy or mixing entropy, and some unique microstructures of HEAs. Consequently, many impressive properties of HEAs, including outstanding dynamical mechanical performance, have been reported successively. Under the instantaneous loading with high strain rates (ε ̇> 10 3 s− 1), dynamic-deformation mechanisms of materials are different from the static one, and the relevant influencing factors are complicated. To reveal the relationship between the unique microstructures of HEAs and their dynamic-mechanical properties, 76 articles published during the period of July 2015 to January 2023 have been reviewed in the present work. Firstly, the statistics and classification of all 61 reported HEAs are systematically done in terms of their processing, experimental method, theoretical model, phases and microstructures as well as the dynamic-mechanical properties. Secondly, theoretical models and deformation mechanism are summarized. The effects of dislocation motion, twinning, and phase transformation behavior on dynamic deformation of HEAs are discussed thoroughly. The adiabatic-shear behavior and its effect on dynamic deformation are also considered. The differences of dynamic-mechanical behavior as well as the relevant mechanisms between HEAs and traditional metallic materials are described. Finally, the potential application under dynamic loads of HEAs are demonstrated thoroughly. The present article additionally deals with the future research directions of dynamic-mechanical behaviors in order to develop novel high-performance HEAs.