Abnormal chemical composition fluctuations in multi-principal-element alloys induced by simple cyclic deformation

作     者：Mengyuan He Nan Jia Xiaochun Liu Yongfeng Shen Liang Zuo Mengyuan He;Nan Jia;Xiaochun Liu;Yongfeng Shen;Liang Zuo

作者机构：Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Institute of MetalsCollege of Materials Science and EngineeringChangsha University Of Science and TechnologyChangsha 410114China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第113卷第18期

页      面：287-295页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Natural Science Foundation of China (NSFC)(No. 51922026) the Fundamental Research Funds for the Central Universities (Nos. N2102005 and N2002005) 

主　　题：Cantor alloy Cyclic deformation Concentration wave EDS maps 

摘      要：High entropy alloys exhibit excellent combination of mechanical properties because of the unique com-position fluctuations,termed as‘concentration wave’.The concentration wave was closely related to mul-tiple aspects,including the fluctuation of local strain energy,local atomic environment,electronegativity,*** we report for the first time that the amplitude of the concentration wave can be mechani-cally tailored under cyclic deformation in a well-known Cantor ***-scale energy-dispersive X-ray spectroscopy(EDS)mapping reveals that cyclic deformation may dynamically induce the clustering of solute atoms with a size of 1-3 nm,thus resulting in a higher concentration wave *** con-centration wave promotes strong interactions between dislocations and local solute *** from the typical Taylor strengthening contribution due to the presence of isolated dislocations,the strength enhancement from the mechanically induced composition fluctuations was quantified to be as high as∼70 MPa,about one-third of the yield strength of the alloy without *** opens up a novel strategy of designing high strength alloys by tailoring solute configurations.