Hardening of two kinds of FeCrAl ODS alloys irradiated by high-energy heavy ions to about 0.8 dpa at nominal 200 °C is investigated. A damage layer of 24 μm in thickness produced by the ion irradiation in the specimens makes possible both the micro- and the nano-hardness tests. Nix-Gao model is used to eliminate the indentation size effect (ISE) from the hardness data of the damage plateau so as to obtain the equivalent bulk hardness values. Results of the hardness tests show that the FeCrAl ODS alloy with 0.8 wt% Hf addition exhibits better resistance to irradiation hardening than that with 0.6 wt% Zr addition. A correlation between the micro- and the nano-hardness data is established as $H{V}_0=74.5H_0$ (HV₀ in unit of kgf/mm², H₀ in unit of GPa) for the ODS alloys. A modified Nix-Gao model which includes a maximum allowable density of the geometrically necessary dislocation (GND) and a non-uniform distribution of GNDs can fit well the nano-hardness data in the entire indentation depth range, including the near surface region with a damage ramp.

研究了两种 FeCrAl ODS 合金在标称 200 °C 下被高能重离子辐照至约 0.8 dpa 的硬化。样品中由离子照射产生的 24 μm 厚的损伤层使微米和纳米硬度测试成为可能。Nix-Gao 模型用于从损伤平台的硬度数据中消除压痕尺寸效应（ISE），以获得等效的体积硬度值。硬度测试结果表明，添加 0.8 wt% Hf 的 FeCrAl ODS 合金比添加 0.6 wt% Zr 的合金表现出更好的抗辐照硬化能力。微米和纳米硬度数据之间的相关性被建立为$高{伏}_0=74.5{高}_0$（以kgf/mm ²为单位的HV ₀，以GPa 为单位的H ₀）用于ODS合金。改进的 Nix-Gao 模型包括几何必要位错 (GND) 的最大允许密度和 GND 的非均匀分布，可以很好地拟合整个压痕深度范围内的纳米硬度数据，包括具有伤害斜坡。