氦在铝表面辐照和积聚的团簇动力学模拟  

Cluster dynamics modeling of helium irradiation and accumulation near aluminum surface

作　　者：魏留明 李永钢 赵高峰[1] 叶小球[3] 肖瑶 曾雉 WEI Liu-Ming;LI Yong-Gang;ZHAO Gao-Feng;YE Xiao-Qiu;XIAO Yao;ZENG Zhi(Institute for Computational Materials Science, Department of Physics, Henan University, Kaifeng 475004, China;Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621907, China)

机构地区：[1]河南大学物理与电子学院计算材料研究所,开封475004 [2]中国科学院固体物理研究所材料物理重点实验室,合肥230031 [3]表面物理与化学重点实验室,绵阳621907

出　　处：《原子与分子物理学报》2020年第2期206-213,共8页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11975018,11775254,11534012);国家磁约束核聚变能发展研究专项课题(2015GB109002);科学挑战项目(TZ2018004);中国科学院青年创新促进会会员项目(2016386);表面物理与化学国家重点实验室基金和科学挑战专题(212018004);河南省高校科技创新人才项目(15HASTIT015)。

摘　　要：我们利用团簇动力学模型(IRadMat)研究了keV-He离子辐照金属铝的缺陷动力学和氦的聚集行为.通过对不同俘获类型(团簇、晶界和位错)俘获He浓度的定量分析,我们发现大多数He原子被晶界吸收,这成为铝在低辐照通量下发生脆化的主要原因.随着辐照能量的增加,He滞留峰的位置会变得更深.然而,随着辐照通量的增加,He在体内的滞留量会变得更多,但滞留深度的峰值位置不变.我们的结果表明,晶界的影响在He的滞留分布以及铝的脆化行为中起着关键作用,这也有助于我们理解He在金属中的动力学行为和损伤的分布.We study the defect dynamic and aggregation behavior of helium in aluminum under keV-He ion irradiation by using a cluster dynamics model(IRadMat).Through the quantitative analysis of the concentration of He by different traps(clusters,grain boundaries and dislocations)we find that most of He atoms are absorbed by grain boundaries,which is the main contribution to embrittlement of Al under low irradiation fluence.With irradiation energy increasing,the position of He retention peak becomes deeper.However,with ion fluence increasing,the amount of He retention in Al becomes more,while the position of retention peak remains unchanged.The results show that the effect of grain boundaries plays a key role in the distribution of He retention and the behavior of embrittlement in Al,which is also helpful for understanding the dynamic behavior of He and the distribution of damages in metals.

关 键 词：He离子辐照 铝 团簇动力学 晶界 

分 类 号：O65[理学—分析化学]