Nucleation and growth of helium bubble at (110) twist grain boundaries in tungsten studied by molecular dynamics

doi:10.1088/1674-1056/28/8/085203

中国物理B ›› 2019, Vol. 28 ›› Issue (8): 85203-085203.doi: 10.1088/1674-1056/28/8/085203

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇下一篇

Nucleation and growth of helium bubble at (110) twist grain boundaries in tungsten studied by molecular dynamics

Fang-Biao Li(李芳镖), Guang Ran(冉广), Ning Gao(高宁), Shang-Quan Zhao(赵尚泉), Ning Li(李宁)

1 College of Energy, Xiamen University, Xiamen 361102, China;
2 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China;
3 School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100094, China

收稿日期:2019-01-23 修回日期:2019-06-06 出版日期:2019-08-05 发布日期:2019-08-05
通讯作者: Guang Ran, Ning Gao E-mail:gran@xmu.edu.cn;ning.gao@impcas.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11305136, 11675230, 11375242, and U1832112).

Nucleation and growth of helium bubble at (110) twist grain boundaries in tungsten studied by molecular dynamics

Fang-Biao Li(李芳镖)¹, Guang Ran(冉广)¹, Ning Gao(高宁)^2,3, Shang-Quan Zhao(赵尚泉)¹, Ning Li(李宁)¹

1 College of Energy, Xiamen University, Xiamen 361102, China;
2 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China;
3 School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100094, China

Received:2019-01-23 Revised:2019-06-06 Online:2019-08-05 Published:2019-08-05
Contact: Guang Ran, Ning Gao E-mail:gran@xmu.edu.cn;ning.gao@impcas.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11305136, 11675230, 11375242, and U1832112).

摘要/Abstract

摘要：

Migration of He atoms and growth of He bubbles in high angle twist grain boundaries (HAGBs) in tungsten (W) are investigated by atomic simulation method. The energy and free volume (FV) of grain boundary (GB) are affected by the density and structure of dislocation patterns in GB. The migration energy of the He atom between the neighboring trapping sites depends on free volume along the migration path at grain boundary. The region of grain boundary around the He bubble forms an ordered crystal structure when He bubble grows at certain grain boundaries. The He atoms aggregate on the grain boundary plane to form a plate-shape configuration. Furthermore, high grain boundary energy (GBE) results in a large volume of He bubble. Thus, the nucleation and growth of He bubbles in twist grain boundaries depend on the energy of grain boundary, the dislocation patterns and the free volume related migration path on the grain boundary plane.

关键词: tungsten, dislocation patterns, ordered grain boundary structure, plate-shape He bubble

Abstract:

Key words: tungsten, dislocation patterns, ordered grain boundary structure, plate-shape He bubble

中图分类号: (Molecular dynamics methods)

52.65.Yy

66.30.J- (Diffusion of impurities ?) 61.72.Mm (Grain and twin boundaries) 66.30.-h (Diffusion in solids)

李芳镖, 冉广, 高宁, 赵尚泉, 李宁. Nucleation and growth of helium bubble at (110) twist grain boundaries in tungsten studied by molecular dynamics[J]. 中国物理B, 2019, 28(8): 85203-085203.

Fang-Biao Li(李芳镖), Guang Ran(冉广), Ning Gao(高宁), Shang-Quan Zhao(赵尚泉), Ning Li(李宁). Nucleation and growth of helium bubble at (110) twist grain boundaries in tungsten studied by molecular dynamics[J]. Chin. Phys. B, 2019, 28(8): 85203-085203.

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Nucleation and growth of helium bubble at (110) twist grain boundaries in tungsten studied by molecular dynamics

Nucleation and growth of helium bubble at (110) twist grain boundaries in tungsten studied by molecular dynamics

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