One of the key challenges for the development of high-performance fusion materials is to design materials capable of maintaining mechanical and structural integrity under the extreme levels of displacement damage, high temperature and transmutation rates. High-entropy alloys (HEAs) and other concentrated alloys have attracted attention with regards to their performance under fusion conditions. In recent years, a number of investigations of the irradiation responses of HEAs have peaked the community’s interest in them, such as the work of Kumar et al. (2016), who examined Fe₂₇Ni₂₈Mn₂₇Cr₁₈ at doses as high as 10 dpa. In this work, we study Fe₂₈Ni₂₈Mn₂₆Cr₁₈ concentrated multicomponent alloy with irradiation doses as high as 20 dpa. We find the presence of Cr rich bcc precipitates in both the un-irradiated and in the irradiated condition, and the presence of dislocation loops only in the irradiated state. We correlate the features found with irradiation hardening by the continuous stiffness method (CSM) depth-sensing nanoindentation technique and see that the change in the bulk hardness increases significantly at 20 dpa for temperatures 450 °C. These results indicate that the alloy is neither stable as a single phase after annealing at 900 °C, nor particularly resistant to irradiation hardening.

开发高性能聚变材料的关键挑战之一是设计能够在极端水平的位移损伤、高温和嬗变率下保持机械和结构完整性的材料。高熵合金 (HEAs) 和其他浓缩合金因其在熔融条件下的性能而受到关注。近年来，对 HEA 辐照反应的一些研究使社区对它们的兴趣达到顶峰，例如 Kumar 等人的工作。(2016)，他检查了剂量高达 10 dpa 的Fe ₂₇ Ni ₂₈ Mn ₂₇ Cr ₁₈。在这项工作中，我们研究了Fe ₂₈ Ni ₂₈ Mn ₂₆ Cr₁₈浓缩多组分合金，辐照剂量高达 20 dpa。我们发现在未辐照和辐照条件下都存在富含 Cr 的 bcc 沉淀物，并且仅在辐照状态下存在位错环。我们通过连续刚度法 (CSM) 深度传感纳米压痕技术将辐照硬化发现的特征相关联，并看到体积硬度的变化在 20 dpa 和 450 °C 的温度下显着增加。这些结果表明该合金在 900 °C 退火后既不是稳定的单相，也不是特别耐辐照硬化。