We investigated the temperature-dependent mechanical properties and deformation mechanisms of the FeMnCoCrCTiVMo alloy from room temperature to cryogenic temperatures. As the deformation temperature decreased, both the strength and strain-hardening rate increased, while ductility tended to decrease. The higher strength of the material deformed at 123 K, compared to that deformed at 223 K, can be attributed to the larger number of multivariant HCP plates and higher hetero deformation induced (HDI) strengthening in the former. Multivariant deformation-induced HCP plates were the primary deformation mechanisms at all deformation temperatures, and cryogenic deformation activated intersecting shear, defined as the primary HCP plate being sheared by the secondary HCP plate. This mechanism contributed to stress relaxation and enhanced deformation accommodation. The reduced ductility observed in the material deformed at 123 K may be attributed to coarse edge and grain boundary cracks, which were more pronounced when the TRIP effect was enhanced.

中文翻译：

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多变体变形诱导 HCP 板对 FCC 高熵合金低温力学性能的影响

我们研究了 FeMnCoCrCTiVMo 合金从室温到低温的温度依赖性机械性能和变形机制。随着变形温度降低，强度和应变硬化率均增加，而延展性则趋于降低。与在 223 K 变形的材料相比，在 123 K 变形的材料具有更高的强度，这可归因于前者具有更多的多元 HCP 板和更高的异质变形诱导 (HDI) 强化。多元变形引起的 HCP 板是所有变形温度下的主要变形机制，低温变形激活相交剪切，定义为主 HCP 板被次级 HCP 板剪切。这种机制有助于应力松弛和增强变形调节。在 123 K 变形的材料中观察到的延展性降低可能归因于粗边缘和晶界裂纹，当 TRIP 效应增强时，这些裂纹更加明显。