title: A promising new class of high-temperature alloys: eutectic high-entropy alloys.
abstract: High-entropy alloys (HEAs) can have either high strength or high ductility, and a simultaneous achievement of both still constitutes a tough challenge. The inferior castability and compositional segregation of HEAs are also obstacles for their technological applications. To tackle these problems, here we proposed a novel strategy to design HEAs using the eutectic alloy concept, i.e. to achieve a microstructure composed of alternating soft fcc and hard bcc phases. As a manifestation of this concept, an AlCoCrFeNi2.1 (atomic portion) eutectic high-entropy alloy (EHEA) was designed. The as-cast EHEA possessed a fine lamellar fcc/B2 microstructure, and showed an unprecedented combination of high tensile ductility and high fracture strength at room temperature. The excellent mechanical properties could be kept up to 700°C. This new alloy design strategy can be readily adapted to large-scale industrial production of HEAs with simultaneous high fracture strength and high ductility.
authors.affiliation: 1] School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China [2] State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China.
authors.forename: Yiping
authors.initials: Y
authors.lastname: Lu
authors.affiliation: School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Dong
authors.affiliation: Surface and Microstructure Engineering Group, Materials and Manufacturing Technology, Chalmers University of Technology, SE-41296, Gothenburg, Sweden.
authors.forename: Sheng
authors.initials: S
authors.lastname: Guo
authors.affiliation: School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China.
authors.forename: Li
authors.initials: L
authors.lastname: Jiang
authors.affiliation: School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China.
authors.forename: Huijun
authors.initials: H
authors.lastname: Kang
authors.affiliation: Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, China.
authors.forename: Tongmin
authors.initials: T
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Wen
authors.affiliation: 1] Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong, China [2] State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China.
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Wang
authors.affiliation: School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China.
authors.forename: Jinchuan
authors.initials: J
authors.lastname: Jie
authors.affiliation: School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Cao
authors.affiliation: Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China.
authors.forename: Haihui
authors.initials: H
authors.lastname: Ruan
authors.affiliation: 1] School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China [2] State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China.
authors.forename: Tingju
authors.initials: T
authors.lastname: Li