Lattice distortion enabling enhanced strength and plasticity in high entropy intermetallic alloy

H. Wang; P. Y. Yang; W. J. Zhao; S. H. Ma; J. H. Hou; Q. F. He; C. L. Wu; H. A. Chen; Q. Wang; Q. Cheng; B. S. Guo; J. C. Qiao; W. J. Lu; S. J. Zhao; X. D. Xu; C. T. Liu; Y. Liu; C. W. Pao; Y. Yang

doi:10.1038/s41467-024-51204-0

Nature Communications (Aug 2024)

Lattice distortion enabling enhanced strength and plasticity in high entropy intermetallic alloy

H. Wang,
P. Y. Yang,
W. J. Zhao,
S. H. Ma,
J. H. Hou,
Q. F. He,
C. L. Wu,
H. A. Chen,
Q. Wang,
Q. Cheng,
B. S. Guo,
J. C. Qiao,
W. J. Lu,
S. J. Zhao,
X. D. Xu,
C. T. Liu,
Y. Liu,
C. W. Pao,
Y. Yang

Affiliations

H. Wang: Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong
P. Y. Yang: Research Center for Applied Sciences, Academia Sinica
W. J. Zhao: Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong
S. H. Ma: Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong
J. H. Hou: Department of Mechanical and Energy Engineering, Southern University of Science and Technology
Q. F. He: Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong
C. L. Wu: Research Center for Applied Sciences, Academia Sinica
H. A. Chen: Department of Materials and Mineral Resources Engineering, National Taipei University of Technology
Q. Wang: Laboratory for Microstructures, Institute of Materials, Shanghai University
Q. Cheng: Centre for High Resolution Electron Microscopy, College of Materials Science and Engineering, Hunan University
B. S. Guo: Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong
J. C. Qiao: School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University
W. J. Lu: Department of Mechanical and Energy Engineering, Southern University of Science and Technology
S. J. Zhao: Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong
X. D. Xu: Department of Materials and Mineral Resources Engineering, National Taipei University of Technology
C. T. Liu: Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong
Y. Liu: State Key Laboratory of Powder Metallurgy, Central South University
C. W. Pao: Research Center for Applied Sciences, Academia Sinica
Y. Yang: Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong

DOI: https://doi.org/10.1038/s41467-024-51204-0
Journal volume & issue: Vol. 15, no. 1
pp. 1 – 10

Abstract

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Abstract Intermetallic alloys have traditionally been characterized by their inherent brittleness due to their lack of sufficient slip systems and absence of strain hardening. However, here we developed a single-phase B2 high-entropy intermetallic alloy that is both strong and plastic. Unlike conventional intermetallics, 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 triggered by dislocation gliding that preserves its strength across a wide range of temperatures. As a result, this high-entropy intermetallic circumvents precipitous thermal softening, with extensive plastic flows even at high homologous temperatures, outperforming a variety of both body-centered cubic and B2 alloys. These findings reveal a promising direction for the development of intermetallic alloys with broad engineering applications.

Published in Nature Communications

ISSN: 2041-1723 (Online)
Publisher: Nature Portfolio
Country of publisher: United Kingdom
LCC subjects: Science
Website: https://www.nature.com/ncomms/

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