中国物理B ›› 2017, Vol. 26 ›› Issue (11): 113401-113401.doi: 10.1088/1674-1056/26/11/113401
• ATOMIC AND MOLECULAR PHYSICS • 上一篇 下一篇
Helium nano-bubble bursting near the nickel surface
Heng-Feng Gong(龚恒风), Min Liu(刘敏), Fei Gao(高飞), Rui Li(李锐), Yan Yan(严岩), Heng Huang(黄恒), Tong Liu(刘彤), Qi-Sen Ren(任啟森)
- 1. ATF R & D Accident Tolerant Fuel Research and Development, China Nuclear Power Technology Research Institute Co., Ltd, Shenzhen 518000, China;
2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Division of Nuclear Materials and Engineering, Shanghai 201800, China;
3. Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences, Shanghai 201800, China;
4. Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
Helium nano-bubble bursting near the nickel surface
Heng-Feng Gong(龚恒风)1,2,3,4, Min Liu(刘敏)2, Fei Gao(高飞)4, Rui Li(李锐)1, Yan Yan(严岩)1, Heng Huang(黄恒)1, Tong Liu(刘彤)1, Qi-Sen Ren(任啟森)1
- 1. ATF R & D Accident Tolerant Fuel Research and Development, China Nuclear Power Technology Research Institute Co., Ltd, Shenzhen 518000, China;
2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Division of Nuclear Materials and Engineering, Shanghai 201800, China;
3. Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences, Shanghai 201800, China;
4. Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
摘要：
We have investigated the expansion and bursting of a helium nano-bubble near the surface of a nickel matrix using a molecular dynamics simulation. The helium atoms erupt from the bubble in an instantaneous and volcano-like process, which leads to surface deformation consisting of cavity formation on the surface, along with modification and atomic rearrangement at the periphery of the cavity. During the kinetic releasing process, the channel may undergo the “open” and “close” states more than once due to the variation of the stress inside the nano-bubble. The ratio between the number of helium atoms and one of vacancies can directly reflect the releasing rate under different temperatures and crystallographic orientation conditions, respectively. Moreover, a special relationship between the stress and He-to-vacancy ratio is also determined. This model is tested to compare with the experimental result from Hastelloy N alloys implanted by helium ions and satisfactory agreement is obtained.
中图分类号: (General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.))
- 34.10.+x