Recent experiments on ion irradiation of oxide dispersion strengthened (ODS) materials to high doses at 500°C performed at the CEA-JANNuS-Saclay facility, in which nanosized oxide particles exhibited changes in the size distribution resulting in a decrease of the number density and an increase of the average nanoparticle size, are analysed. It is shown that the nanoparticle size coarsening observed either in the irradiation tests (at 500°C) or in the annealing tests (at 1300°C) can be described self-consistently within the Brownian coagulation theory. The developed model gives also a reasonable prediction for the coarsening of nanosized particles under neutron irradiation, observed in the commercial ODS alloy MA957 irradiated in the French fast breeder reactor Phénix.

在CEA-JANNuS-Saclay设施上进行的有关氧化物弥散强化（ODS）材料在500°C的高剂量下离子辐照的最新实验，其中纳米级氧化物颗粒的尺寸分布发生变化，从而导致数量密度和密度的降低。分析了平均纳米颗粒尺寸的增加。结果表明，在布朗凝聚理论中，可以一致地描述在辐照试验（在500°C下）或退火试验（在1300°C下）中观察到的纳米粒度粗化。所开发的模型还给出了在中子辐照下纳米尺寸颗粒粗化的合理预测，这是在法国快速增殖反应堆Phénix辐照的商用ODS合金MA957中观察到的。