Molecular dynamics method is used and scheme of calculational tests is designed. The atomic evolution view of the interaction between grain boundary (GB) and irradiation-induced point defects is given in six symmetric tilt GB structures of bcc tungsten with the energy of the primary knock-on atom (PKA) E_PKA of 3 and 5 keV and the simulated temperature of 300 K. During the collision cascade with GB structure there are synergistic mechanisms to reduce the number of point defects: one is vacancies recombine with interstitials, and another is interstitials diffuse towards the GB with vacancies almost not move. The larger the ratio of the peak defect zone of the cascades overlaps with the GB region, the statistically relative smaller the number of surviving point defects in the grain interior (GI); and when the two almost do not overlap, vacancy-intensive area generally exists nearby GBs, and has a tendency to move toward GB with the increase of E_PKA. In contrast, the distribution of interstitials is relatively uniform nearby GBs and is affected by the E_PKA far less than the vacancy. The GB has a bias-absorption effect on the interstitials compared with vacancies. It shows that the number of surviving vacancies statistically has increasing trend with the increase of the distance between PKA and GB. While the number of surviving interstitials does not change much, and is less than the number of interstitials in the single crystal at the same conditions. The number of surviving vacancies in the GI is always larger than that of interstitials. The GB local extension after irradiation is observed for which the interstitials absorbed by the GB may be responsible. The designed scheme of calculational tests in the paper is completely applicable to the investigation of the interaction between other types of GBs and irradiation-induced point defects.

采用了分子动力学方法，设计了计算试验方案。给出了六种bcc钨的对称倾斜GB结构中的晶界（GB）与辐照诱发的点缺陷之间相互作用的原子演化图，以及主撞击原子（PKA）E _PKA的能量3和5 keV，模拟温度为300K。在与GB结构的碰撞级联过程中，存在减少点缺陷数量的协同机制：一种是空隙与间隙重新结合，另一种是间隙几乎扩散到GB上不动。级联的最大缺陷区与GB区域重叠的比例越大，在晶粒内部（GI）中的存活点缺陷的数量在统计学上相对较小；反之，当两者几乎不重叠时，空位密集区通常存在于GBs附近，并且随着E _PKA的增加趋向GB 。相反，插页式广告的分布在GB附近相对均匀，并且受E _PKA的影响远远少于空缺。与空位相比，GB对间隙具有偏斜吸收作用。结果表明，随着PKA和GB之间距离的增加，剩余的空缺数量有统计上的增加趋势。幸存的填隙的数量变化不大，并且小于相同条件下单晶中的填隙的数量。地理信息系统中尚存的空缺数量总是大于插页式广告中的空缺数量。观察到辐射后的GB局部延伸，这可能是由GB吸收的间隙造成的。本文设计的计算测试方案完全适用于研究其他类型的GB与辐射诱发的点缺陷之间的相互作用。