Towards ultrastrong and ductile medium-entropy alloy through dual-phase ultrafine-grained architecture

查看全文 作　　者：Zhen [1]Chen;Hongbo [2]Xie;Haile [2]Yan;Xueyong [2]Pang;Yuhui [3]Wang;Guilin [4]Wu;Lijun [5]Zhang;Hu [1]Tang;Bo [6]Gao;Bo [2]Yang;Yanzhong [2]Tian;Huiyang [1]Gou;Gaowu [2]Qin

机构地区：[1]Center for High Pressure Science&Technology Advanced Research(Beijing),Beijing 100094,China;[2]Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;[3]National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,China;[4]Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing 100083,China;[5]School of Materials and Engineering,Shandong University of Science and Technology,Qingdao 266590,China;[6]Instrumental Analysis Center,Taiyuan University of Science and Technology,Taiyuan 030024,China

出　　处：《Journal of Materials Science & Technology》索引2022年第31期,共9页

基　　金：supported by the National Natural Science Foundation of China(Nos.U1530401,52071038,51871194);the Fundamental Research Funds for the Central Universities(No.N2102008);the Innovation Research Group Project of Hebei Natural Science Foundation,China(No.E2021203011). 摘　　要：Advanced materials with superior comprehensive mechanical properties are strongly desired,but it has long been a challenge to achieve high ductility in high-strength materials.Here,we proposed a new V 0.5 Cr 0.5 CoNi medium-entropy alloy(MEA)with a face-centered cubic/hexagonal close-packed(FCC/HCP)dual-phase ultrafine-grained(UFG)architecture containing stacking faults(SFs)and local chemical order(LCO)in HCP solid solution,to obtain an ultrahigh yield strength of 1476 MPa and uniform elongation of 13.2%at ambient temperature.The ultrahigh yield strength originates mainly from fine grain strength-ening of the UFG FCC matrix and HCP second-phase strengthening assisted by the SFs and LCO inside,whereas the large ductility correlates to the superior ability of the UFG FCC matrix to storage disloca-tions and the function of deformation-induced SFs in the vicinity of the FCC/HCP boundary to eliminate the stress concentration.This work provides new guidance by engineering novel composition and stable UFG structure for upgrading the mechanical properties of metallic materials. 关键词：Medium-entropy alloy FCC/HCP dual-phase Strength and ductility Ultrafine-grained(UFG) Multiple hardening mechanisms

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Towards ultrastrong and ductile medium-entropy alloy through dual-phase ultrafine-grained architecture

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