氦离子低温预辐照对不锈钢中氦泡生长抑制作用的Monte Carlo模拟研究∗

摘要

实验中已发现氦离子低温预辐照不锈钢材料能有效抑制高温辐照阶段的氦泡生长，但这一结果一直缺少理论解释。基于持续注入粒子的三维格子气模型，采用Monte Carlo模拟方法研究了不同温度模式对氦泡生长行为的影响。研究发现，计算结果能很好地再现氦离子低温预注入抑制高温氦泡生长的实验现象，其原理为低温预注入时材料中形成了较高数密度的小氦泡，由于氦泡数量较多从而限制了氦泡平均尺寸的增大。%Zhang Chong-Hong group has found that pre-irradiation of helium ions at low temperature with very low dose could effectively suppress helium bubble growth in materials. This experimental result lacks theoretical explanation. In this paper, we use Monte Carlo simulation to study the effects of different temperature modes on helium bubbles based on a three-dimensional lattice gas model under continued particle injection, and find that the phenomenon that pre-irradiation of helium atoms at low temperature can suppress the helium bubble growth occurs in simulation results as it does in the experiments. The reason is that small helium bubbles with high number density are produced by pre-irradiation at low temperature, and the high number density of bubbles controls the increase of sizes of helium bubbles.