Fe-15Cr-15Ni (wt.%) austenitic stainless steel was irradiated with 200 keV ⁴He⁺ ions to a fluence of 5 × 10¹⁶/cm² at 500 °C. Radiation-induced segregation (RIS) at He bubbles in the irradiated steel was measured using Energy Dispersive X-ray Spectroscopy (EDS) coupled with Scanning Transmission Electron Microscopy (STEM). The RIS measurements exhibited an enrichment of Ni and a depletion of Cr and Fe at the bubbles. To determine the underlying mechanisms of the RIS, the prediction of the Marwick model was compared with the RIS measurements. The model with parametric input in accordance with the Inverse Kirkendall effect (IKE), i.e. a preferential flux of elements associated with vacancy flux, was inadequate in explaining the observed amount of segregation of Fe, Cr and Ni. Specifically, a considerably lower ratio of the concentration gradient between Cr and Fe, $\frac{\nabla \text{Cr}}{\nabla \text{Fe}}$, of 0.53 was obtained from the RIS measurements versus the model-predicted value of 2.3, indicating an overestimation of Cr depletion at the bubbles by the Marwick model. To explain this difference between the model prediction and the RIS measurements, in addition to the Cr depletion at the bubbles by IKE due to the fastest diffusion via vacancy flux, a preferential interstitial flux of Cr from the matrix to the bubbles is discussed as a possible concurrently operating mechanism.

对Fe-15Cr-15Ni（wt。％）奥氏体不锈钢进行200 keV ⁴ He ⁺离子辐照，通量为5×10 ¹⁶ / cm ²在500°C下。使用能量色散X射线光谱法（EDS）和扫描透射电子显微镜（STEM）来测量被辐照钢中He气泡处的辐射诱导偏析（RIS）。RIS测量结果显示，气泡处Ni富集，Cr和Fe耗尽。为了确定RIS的潜在机制，将Marwick模型的预测与RIS测量值进行了比较。根据逆柯肯德尔效应（IKE）进行参数输入的模型（即与空位通量相关的元素的优先通量）不足以解释所观察到的Fe，Cr和Ni的偏析量。具体来说，Cr和Fe之间的浓度梯度比例要低得多，$\frac{\nabla \text{铬}}{\nabla \text{铁}}$通过RIS测量获得的0.53相对于模型预测的2.3为0.53，表明Marwick模型高估了气泡处的Cr损耗。为了解释模型预测和RIS测量之间的这种差异，除了由于空位通量最快扩散导致的IKE使气泡使Cr耗竭外，还讨论了Cr从基体到气泡的优先间隙通量。并发运行机制。