中文摘要：

研究辐照下He在氧化物弥散强化材料中小于5nm的氧化物颗粒的稳定性。在有He环境下，对14YWT氧化物弥散强化材料进行高温离子辐照。采用三维原子探针（APT）对辐照前后样品中的氧化物颗粒的大小、密度、成分以及其空间分布进行分析。结果表明：小于5nm的弥散氧化物颗粒主要是由Y和Ti的氧化物组成，在辐照前后其成分、尺寸和空间分布无明显变化，说明在600℃高温重离子辐照过程中，在有He环境下铁索体ODS材料中弥散氧化物颗粒仍具有良好的稳定性。

英文摘要：

The stability of nano-scale oxides with the size less than 5nm in the helium atmosphere under irradiation in the ODS（oxide dispersion strengthened） materials was researched. The 14YWT alloy with pre-implanted with helium was irradiated at high temperature. Size, density, and composition of the nano-scale oxides were investigated by the atom probe tomography. The results show that nano-scale oxides are composed of oxides enrich in Ti and Y. The change of the size and composition of the nano-scale oxides under irradiation is trivial, indicating the good stability of nano-scale oxides in helium pre-implanted ODS materials under irradiation at 600℃.