高熵合金中的成分非均匀性及其作用-中国材料进展

文章信息/Info

作者:: 符晓倩; 余倩; 1. 浙江大学材料科学与工程学院硅材料国家重点实验室电子显微镜中心，浙江杭州 310027 2. 海南大学精密仪器高等研究中心海洋材料表征技术创新研究院皮米电镜中心，海南海口 570228

Author(s):: FU Xiaoqian; YU Qian; 1.Center of Electron Microscopy, State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China 2.Pico Electron Microscopy Center, Innovation Institute for Ocean Materials Characterization Technology, Center for Advanced Studies on Precision Instruments, Hainan University, Haikou 570228, China

Keywords:: high-entropy alloys; compositional heterogeneity; chemical short-range ordering; concentration variation; dislocations behavior; mechanical property

摘要:: 高熵合金因其独特的结构特征和优异的力学性能受到了研究人员的广泛关注。最初，高熵合金被认为是理想的固溶体，具有完全随机混乱的元素分布。而近期越来越多的研究表明，高熵合金中广泛存在元素分布的非均匀性，包括局域的化学短程有序和元素浓度波动，这里统称为成分非均匀性。了解高熵合金中成分非均匀性的结构细节及其对于力学行为的作用至关重要。近五年，不少工作对此进行了探究。简要综述了国内外关于高熵合金中成分非均匀性的研究，基于其对位错滑移的影响总结了相关材料强化机制，并展望了高熵合金中成分非均匀性的未来研究趋势。

Abstract:: High-entropy alloys have attracted much attention in recent years because of their unique structural characteristics and excellent mechanical properties.Originally, high-entropy alloys were considered to be ideal solid solutions with completely random element distributions. While recently, more and more studies have shown that inhomogeneity of element distribution exists widely in high-entropy alloys, including local chemical short-range ordering and element concentration fluctuations, which are collectively referred to as compositional heterogeneity here. It is of vital importance to understand the fine structure of compositional heterogeneity and its role in tuning mechanical behaviors of high-entropy alloys. In recent five years, lots of work probe into the mystery. In this paper, we briefly review the research on compositional heterogeneity in high-entropy alloys and its influence on the strengthening mechanisms and mechanical properties, and further prospect the future research in the relevant field.