Strain-rate dependence in face centered cubic high entropy alloys still remains controversial despite extensive efforts on this topic. Strain-rate sensitivity reflects underlying thermally-activated deformation and the controversy boils down to the deformation mechanism. There has been disagreement even on the experimental values of the strain-rate sensitivity and activation volume. This study reviewed and analyzed the differences in experimental values and proposed mechanisms to resolve the controversy over the nature of thermal obstacles in CrMnFeCoNi alloy. TEM study on CrMnFeCoNi supports the presence of nanoscale heterogeneity elucidating the nature of rate-controlling mechanism in the alloy.

尽管在这一主题上进行了广泛的努力，但面心立方高熵合金中的应变率依赖性仍然存在争议。应变率敏感性反映了潜在的热激活变形，争论归结为变形机理。甚至在应变率敏感性和活化体积的实验值上也存在分歧。本研究回顾并分析了实验值的差异，并提出了解决有关CrMnFeCoNi合金热障性质的争议的机制。CrMnFeCoNi的TEM研究证明存在纳米级异质性，阐明了合金中速率控制机制的性质。