体心立方钨和铁中氦泡生长机制模拟研究进展

Progress in Simulation of Helium Bubble Growth in Body-centered Cubic Tungsten and Iron

体心立方金属钨和铁作为核聚变反应堆的第一壁面向等离子体材料和第一壁结构材料处于高剂量的中子辐照环境中。辐照过程产生的氦原子易在金属内聚集形成氦泡,对材料微观结构和宏观力学性能产生极大影响。本文通过综合分析文献中关于通过第一性原理、分子动力学和蒙特卡罗方法对氦泡形核和生长机制,比较了不同模拟条件下氦泡的演化机制。分析表明,晶界、位错、空位等内部缺陷和温度等外部条件都对氦泡的形核及其生长机制有影响。在此基础上提出了下一步研究方向和思路。

Body-centered cubic tungsten and iron are two important first wall facing plasma material and first wall structure material for nuclear fusion reactor respectively,and have to endure heavy doses neutron radiation.During neutron irradiation,a large number of helium atoms tend to agglomerate into helium bubbles,leading to mechanical property deterioration of the materials.In this paper,the evolution mechanism of helium bubble under different simulation conditions was compared by comprehensively analyzing the literatures about the nucleation and growth mechanism of helium bubbles by first principles,molecular dynamics and Monte Carlo methods.The results show that internal defects such as grain boundary,dislocation,vacancy and external conditions such as temperature can affect the nucleation and growth mechanism of helium bubbles.In addition,suggestions for further development are given.