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 Vo.sCro.sCoNi 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.

Zhen Chen;Hongbo Xie;Haile Yan;Xueyong Pang;Yuhui Wang;Guilin Wu;Lijun Zhang;Hu Tang;Bo Gao;Bo Yang;Yanzhong Tian;Huiyang Gou;Gaowu Qin

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

材料科学技术（英文版）

[1]Zhen Chen;Hongbo Xie;Haile Yan;Xueyong Pang;Yuhui Wang;Guilin Wu;Lijun Zhang;Hu Tang;Bo Gao;Bo Yang;Yanzhong Tian;Huiyang Gou;Gaowu Qin-.Towards ultrastrong and ductile medium-entropy alloy through dual-phase ultrafine-grained architecture)[J].材料科学技术（英文版）,2022(31):228-236

ultrastrong,sCro,sCoNi,disloca

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