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

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2024年8月8日

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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

摘要

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.