立方晶体结构的高熵合金在低温条件下力学行为的研究进展

On the Recent Development of Mechanical Behavior of Cubic High-entropy Alloys at Cryogenic Temperature

摘要:

近年来,立方晶体结构的高熵合金的在低温条件下(77K)的力学性能成为了研究热点。研究发现,由于一些立方晶体结构体系的高熵合金的层错能随着温度的降低而降低,比较室温条件下,其低温综合力学性能呈现提高的趋势,是一种很有希望的高性能低温结构材料。本文综述了近年来一些立方晶体结构的高熵合金在低温条件下的力学行为的研究进展,重点对高熵合金在低温环境下塑性变形过程中的强韧化机理进行了讨论,并给出了未来的发展方向。

Abstract:

In recent years, the researches on the mechanical behavior of high-entropy alloys with cubic structure at cryogenic temperature (77K) have become a hot topic. It is found that stacking fault energy (SFE) of some cubic high-entropy alloys decreases with the decrease of temperature. Compared with that at room temperature, the mechanical properties of these alloys at cryogenic temperature show remarkable increase, suggesting their tremendous potential as promising structural materials used at cryogenic-temperature. In this paper, recent progress on the mechanical behavior of high-entropy alloys with cubic structure at cryogenic temperature are reviewed systematically, focusing on the underlying mechanisms of strengthening and toughening during plastic deformation. At last, the possible future development trend is also given.