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 () and Y. Yang ()
Additional contact information
H. Wang: Kowloon Tong
P. Y. Yang: Academia Sinica
W. J. Zhao: Kowloon Tong
S. H. Ma: Kowloon Tong
J. H. Hou: Southern University of Science and Technology
Q. F. He: Kowloon Tong
C. L. Wu: Academia Sinica
H. A. Chen: National Taipei University of Technology
Q. Wang: Shanghai University
Q. Cheng: Hunan University
B. S. Guo: Kowloon Tong
J. C. Qiao: Northwestern Polytechnical University
W. J. Lu: Southern University of Science and Technology
S. J. Zhao: Kowloon Tong
X. D. Xu: National Taipei University of Technology
C. T. Liu: Kowloon Tong
Y. Liu: Central South University
C. W. Pao: Academia Sinica
Y. Yang: Kowloon Tong

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-51204-0

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