Double heterogeneous structures induced excellent strength-ductility synergy in Ni_(40)Co_(30)Cr_(20)Al_(5)Ti_(5) medium-entropy alloy

作     者：A.X.Li X.S.Liu R.Li S.B.Yu M.H.Jiang J.S.Zhang C.N.Che D.Huang P.F.Yu G.Li A.X.Li;X.S.Liu;R.Li;S.B.Yu;M.H.Jiang;J.S.Zhang;C.N.Che;D.Huang;P.F.Yu;G.Li

作者机构：State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China 

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

年 卷 期：2024年第181卷第14期

页      面：176-188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 National Key R&D Program of China(No.2022YFA1603800) the National Natural Science Foundation of China(No.12274362) the Central Guidance on Local Science and Technology Development Fund of Hebei Province(No.216Z1012G) 

主　　题：Medium entropy alloy Double heterogeneous structure HDI strengthening Remarkable tensile properties 

摘      要：The application of single-phase face-centered cubic(FCC)medium entropy alloys(MEAs)in the engi-neering industry is often hindered by the challenge of insufficient *** this study,a novel non-equiatomic ratio Ni_(40)Co_(30)Cr_(20)Al_(5)Ti_(5)MEA was successfully *** the well-designed mechan-ical heat treatment processing,we introduced a heterogeneous grain structure comprising 67.4%fine grain and 32.6%coarse ***,heterogeneous size L12 phases consisting of 18.7%submicron precip-itates and 11.7%nano-sized precipitates,were incorporated into the *** tests conducted at room temperature revealed that the double heterogeneous structure alloy demonstrated remarkable strength–ductility *** exhibited a yield strength of 1200 MPa,an ultimate tensile strength of 1560 MPa and a total elongation of 33.6%.The exceptional strength of the alloy can be primarily attributed to heteroge-neous deformation induced strengthening,grain boundary strengthening and precipitation *** excellent ductility is mainly attributed to the high-density stacking faults and Lomer–Cottrell *** study not only contributes to the clarification of the strengthening and deformation mechanism of double heterogeneous structure alloys but also provides an effective strategy for the development of high-performance alloys with high strength and ductility.