The present paper reports the irradiation behavior of nanostructured NiCoCr medium entropy alloy enhanced by Y-Hf-O nanooxides and fine grains produced by powder metallurgy. Ion beam irradiation to a peak dose of 130 dpa at 580°C produced neither detectable void swelling nor irradiation-induced hardening, in contrast to significant void swelling and property degradation of single phase NiCoCr concentrated solid-solution alloy under the similar irradiation condition. The dispersed nanooxides and high density of grain boundaries act as defect sinks that effectively annihilate irradiation-induced interstitials and vacancies. Furthermore, high-density nanooxides maintain their crystalline structures and stabilize the grain boundaries during irradiation.

本文报道了由 Y-Hf-O 纳米氧化物和粉末冶金产生的细晶粒增强的纳米结构 NiCoCr 中等熵合金的辐照行为。与在类似辐照条件下单相 NiCoCr 浓缩固溶体合金的显着孔隙膨胀和性能退化相比，在 580°C 下以 130 dpa 的峰值剂量辐照离子束既没有产生可检测的孔隙膨胀也没有产生辐照诱导的硬化。分散的纳米氧化物和高密度的晶界作为缺陷汇，有效地消除了辐射诱导的间隙和空位。此外，高密度纳米氧化物在辐照过程中保持其晶体结构并稳定晶界。