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Lattice distortion enabling enhanced strength and plasticity in high entropy intermetallic alloy
H. Wang1,12, P.Y. Yang2,12, W.J. Zhao1,3,12, S.H. Ma1, J.H. Hou4, Q.F. He1,5, C.L. Wu2, H.A. Chen6, Q. Wang7, Q. Cheng8, B.S. Guo1,9, J.C. Qiao10, W.J. Lu4, S.J. Zhao1, X.D. Xu6,C.T. Liu1,11, Y. Liu3,*, C.W. Pao2,*, Y. Yang1,11,*
1Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong, China.
2Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan.
3State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, China.
4Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China.
5Institute of Materials Modification and Modeling, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.
6Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan.
7Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai, China.
8Centre for High Resolution Electron Microscopy, College of Materials Science and Engineering, Hunan University, Changsha, Hunan, China.
9Institute of Advanced Wear & Corrosion Resistant and Functional Materials, Jinan University, Guangzhou, Guangdong, China.
10School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an, Shanxi, China.
11Department of Materials Science and Engi neering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong, China.
Abstract:
Intermetallic alloys have traditionally been characterized by their inherent brittleness due to their lack of sufficientslipsystemsandabsenceofstrain hardening. However, here we developed a single-phase B2 high-entropy intermetallic alloy that is both strong and plastic. Unlike conventional inter metallics, this high-entropy alloy features a highly distorted crystalline lattice with complex chemical order, leading to multiple slip systems and high flow stress. In addition, the alloy exhibits a dynamic hardening mechanism trig gered by dislocation gliding that preserves its strength across a wide range of temperatures. As a result, this high-entropy intermetallic circumvents pre cipitous thermal softening, with extensive plastic flowsevenathighhomo logous temperatures, outperforming a variety of both body-centered cubic andB2alloys.Thesefindingsrevealapromisingdirectionforthedevelopment of intermetallic alloys with broad engineering applications.
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