Excellent strength-ductility synergy properties of gradient nano-grained structural CrCoNi medium-entropy alloy

作     者：Wenjie Lu Xian Luo Dou Ning Miao Wang Chao Yang Miaoquan Li Yanqing Yang Pengtao Li Bin Huang Wenjie Lu;Xian Luo;Dou Ning;Miao Wang;Chao Yang;Miaoquan Li;Yanqing Yang;Pengtao Li;Bin Huang

作者机构：State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an 710072China Langu Institute for Materials Analysis Co.LtdWeihai 264207China School of Physics and Optoelectronic EngineeringYangtze UniversityJingzhou 434023China 

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

年 卷 期：2022年第112卷第17期

页      面：195-201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：financially supported by the National Natural Science Foundation of China(No.51901184) the Natural Science Foundation of Shaanxi Province(2021JM-061) the 2020 Space Science and Technology Foundation of China 

主　　题：Medium-entropy alloy Gradient nano-grained structure High energy shot peening Hetero-deformation induced hardening Strength-ductility synergy 

摘      要：Tailoring heterogeneities could bring out excellent strength-ductility synergy properties.A gradient nanograined(GNG)structure,*** size range from nanometer(~50 nm)at topest surface layer to micrometer(~1.3μm)at center layer,was successfully introduced into CrCoNi medium-entropy alloy(MEA)by means of high energy shot peening in this *** results demonstrated that this GNG CrCoNi MEA shows excellent strength and ductility combination properties,exhibiting high yield strength and ultimate tensile strength of~1215 MPa and~1524 MPa,respectively,while remaining a good ductility of~23.0%.The extraordinary hetero-deformation induced(HDI)hardening origins from heterogeneous structure,*** structure,which contributes to the majority strength *** reinforced heterogeneous structure during tension process results in the enhanced HDI hardening effect,which facilitates excellent ductility and strain hardening capacity at high-level *** work provide not only a feasible and effective way to strengthen the CrCoNi MEA,and other low stacking faults energy(SFE)materials,but also an useful insight to understanding HDI hardening in heterogeneous structure.