Wang H, Yang P Y, Zhao W J, Ma S H, Hou J H, He Q F, Wu C L, Chen H A, Wang Q, Cheng Q, Guo B S, Qiao J C, Lu W J, Zhao S J, Xu X D, Liu C T, Liu Y, Pao C W, Yang Y
Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong, China.
Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan.
Nat Commun. 2024 Aug 8;15(1):6782. doi: 10.1038/s41467-024-51204-0.
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.
传统上，金属间合金因其缺乏足够的滑移系和应变硬化而具有固有的脆性。然而，在此我们开发了一种兼具高强度和塑性的单相B2高熵金属间合金。与传统金属间化合物不同，这种高熵合金具有高度扭曲的晶格和复杂的化学有序性，从而导致多个滑移系和高流动应力。此外，该合金表现出由位错滑移触发的动态硬化机制，使其在很宽的温度范围内保持强度。因此，这种高熵金属间合金避免了急剧的热软化，即使在高同源温度下也能实现广泛的塑性流动，性能优于多种体心立方合金和B2合金。这些发现为具有广泛工程应用的金属间合金的开发揭示了一个有前景的方向。
