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

Abstract

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.

Keywords: tungsten dislocation patterns ordered grain boundary structure plate-shape He bubble

Received: 23 January 2019
Revised: 06 June 2019
Accepted manuscript online:

PACS:	52.65.Yy	(Molecular dynamics methods)
	66.30.J-	(Diffusion of impurities ?)
	61.72.Mm	(Grain and twin boundaries)
	66.30.-h	(Diffusion in solids)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11305136, 11675230, 11375242, and U1832112).

Corresponding Authors: Guang Ran, Ning Gao
E-mail: gran@xmu.edu.cn;ning.gao@impcas.ac.cn

Cite this article:

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 2019 Chin. Phys. B 28 085203

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

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