Статья

A Promising New Class of High-Temperature Alloys: Eutectic High-Entropy Alloys

Yiping Lu1] 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, ChinaYong DongSchool of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaSheng GuoSurface and Microstructure Engineering Group, Materials and Manufacturing Technology, Chalmers University of Technology, SE-41296, Gothenburg, SwedenLi JiangSchool of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaHuijun KangSchool of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaTongmin WangKey Laboratory of Materials Modification by Laser, Ion, and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, ChinaBin WenState Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, ChinaZhijun Wang1] 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, ChinaJinchuan JieSchool of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaZhiqiang CaoSchool of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaHaihui RuanDepartment of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, ChinaTingju Li1] 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

2014en

ABI

Аннотация

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.

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Идентификаторы

DOI: 10.1038/srep06200

Цитирования и источники

Цитирований: 4Использованных источников: 0

Показатели — AkademScholar