A precipitate-free AlCoFeNi eutectic high-entropy alloy with strong strain hardening

作     者：Peijian Shi Yi Li Yuebo Wen Yiqi Li Yan Wang Weili Ren Tianxiang Zheng Yifeng Guo Long Hou Zhe Shen Ying Jiang Jianchao Peng Pengfei Hu Ningning Liang Qingdong Liu Peter K.Liaw Yunbo Zhong Peijian Shi;Yi Li;Yuebo Wen;Yiqi Li;Yan Wang;Weili Ren;Tianxiang Zheng;Yifeng Guo;Long Hou;Zhe Shen;Ying Jiang;Jianchao Peng;Pengfei Hu;Ningning Liang;Qingdong Liu;Peter K.Liaw;Yunbo Zhong

作者机构：State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and EngineeringShanghai UniversityShanghai200444China Materials Genome InstituteShanghai UniversityShanghai200444China Laboratory for MicrostructuresShanghai UniversityShanghai200444China School of Materials Science and EngineeringNanjing University of Science and TechnologyJiangsu210094China Institute of Materials Modification and ModellingSchool of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Department of Materials Science and EngineeringThe University of TennesseeKnoxvilleTN37996USA 

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

年 卷 期：2021年第89卷第30期

页      面：88-96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：financial support from the National Key Research and Development Program of China(Nos.2018YFF0109404,2016YFB0300401 and 2016YFB0301401) the National Natural Science Foundation of China(Nos.U1732276 and U1860202) financial support from the National Natural Science Foundation of China(No.51704193) financial support from the National Natural Science Foundation of China(No.52004156) financial support from the National Natural Science Foundation of China(No.51904184) the supports from the National Science Foundation(DMR-1611180) the US Army Research Office(W911NF-19-2-0049) 

主　　题：High-entropy alloy Lamellar eutectic Deformation resistance Microstructure refinement Strain hardening 

摘      要：Over recent years,eutectic high-entropy alloys(EHEAs)have intrigued substantial research enthusiasms due to their good castability as well as balanced strength-ductility *** this study,a bulk cast Al_(19.25)Co_(18.86)Fe_(18.36)Ni_(43.53)EHEA is developed with fine in-situ lamellar *** eutectics comprise alternating ordered face-centered-cubic(L1_(2))and ordered body-centered-cubic(B2)phases with semicoherent *** resulting microstructure resembles that of most reported as-cast EHEAs,but the B2 lamellae are devoid of nano-precipitates because of the Cr-element removal in current tailored eutectic ***,the B2 lamellae still feature much higher deformation resistance than the L1_(2) lamellae,so that less lattice defects are detected in the B2 lamellae until the *** interestingly,in the L1_(2) lamellae we identify a dynamic microstructure refinement that correlates to extraordinary strain hardening in *** precipitate-free EHEA consequently shows excellent tensile ductility of~10%and high ultimate strength up to~956 MPa.