Oxide dispersion-strengthened (ODS) steel is one of the most prominent candidates as the fuel cladding or blanket component in advanced nuclear reactors. The stability and evolution of high-density nanoscale particles in ODS steels during irradiation are of considerable importance in influencing the mechanical properties and irradiation resistance. The microstructure, especially high-density nanoparticles in 12Cr-ODS steel, was investigated in the present study after 1.6 MeV Fe ions irradiation at 450 °C Atomic probe tomography (APT) and transmission electron microscopy (TEM) were used to track the evolution of microstructure at an atomic scale. Results demonstrate the uniform dispersion of numerous Y-Ti-O nanoclusters in the matrix. The average diameter and Y:Ti ratio of the clusters increased after irradiation. The interface-favorable precipitation of irradiation-induced nanosized phase was especially demonstrated. Radiation-enhanced diffusion (RED) combined with Oswald ripening were considered to illustrate the evolution of Y-Ti-O nanoclusters during irradiation. The segregation behavior of was discussed on the basis of the RED accelerated kinetics and thermodynamic.

中文翻译：

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Fe-12Cr ODS 钢中纳米团簇对重离子辐照的响应

氧化物弥散强化（ODS）钢是先进核反应堆中燃料包壳或包层部件最突出的候选材料之一。ODS钢在辐照过程中高密度纳米颗粒的稳定性和演化对于影响机械性能和耐辐照性能具有相当重要的意义。本研究在 450 °C 1.6 MeV Fe 离子辐照后研究了 12Cr-ODS 钢中的微观结构，特别是高密度纳米颗粒。使用原子探针断层扫描 (APT) 和透射电子显微镜 (TEM) 来跟踪原子尺度的微观结构。结果表明大量 Y-Ti-O 纳米团簇均匀分散在基质中。辐照后团簇的平均直径和Y:Ti比值增加。特别证明了辐照诱导的纳米相的界面有利沉淀。辐射增强扩散（RED）与奥斯瓦尔德熟化相结合被认为可以说明 Y-Ti-O 纳米团簇在辐射过程中的演化。基于RED加速动力学和热力学讨论了其偏析行为。