Liu Liyuan, Zhang Yang, Han Jihong, Wang Xiyu, Jiang Wenqing, Liu Chain-Tsuan, Zhang Zhongwu, Liaw Peter K
Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China.
Department of Materials Science and Engineering, College of Engineering, City University of Hong Kong, Hong Kong, 999077, China.
Adv Sci (Weinh). 2021 Dec;8(23):e2100870. doi: 10.1002/advs.202100870. Epub 2021 Oct 22.
Multicomponent high-entropy alloys (HEAs) can be tuned to a simple phase with some unique alloy characteristics. HEAs with body-centered-cubic (BCC) or hexagonal-close-packed (HCP) structures are proven to possess high strength and hardness but low ductility. The faced-centered-cubic (FCC) HEAs present considerable ductility, excellent corrosion and radiation resistance. However, their strengths are relatively low. Therefore, the strategy of strengthening the ductile FCC matrix phase is usually adopted to design HEAs with excellent performance. Among various strengthening methods, precipitation strengthening plays a dazzling role since the characteristics of multiple principal elements and slow diffusion effect of elements in HEAs provide a chance to form fine and stable nanoscale precipitates, pushing the strengths of the alloys to new high levels. This paper summarizes and review the recent progress in nanoprecipitate-strengthened HEAs and their strengthening mechanisms. The alloy-design strategies and control of the nanoscale precipitates in HEAs are highlighted. The future works on the related aspects are outlined.
多组分高熵合金（HEAs）可以被调整为具有一些独特合金特性的单一相。具有体心立方（BCC）或六方密排（HCP）结构的高熵合金已被证明具有高强度和硬度，但延展性较低。面心立方（FCC）高熵合金具有相当的延展性、优异的耐腐蚀性和抗辐射性。然而，它们的强度相对较低。因此，通常采用强化韧性FCC基体相的策略来设计具有优异性能的高熵合金。在各种强化方法中，析出强化起着令人瞩目的作用，因为高熵合金中多种主元素的特性和元素的缓慢扩散效应为形成细小且稳定的纳米级析出物提供了机会，将合金的强度提升到新的高度。本文总结并综述了纳米析出强化高熵合金及其强化机制的最新进展。重点介绍了高熵合金的合金设计策略和纳米级析出物的控制。概述了相关方面未来的工作。
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