The rapid growth of He nanobubbles in vicinity of the axis of W nanofibers under fusion-relevant He ion irradiations

The He nanobubbles growth is one of the key factors in affecting surface microstructures of tungsten-based divertor targets. In this work, the growth of He bubbles in W nanofibers has been studied based on He diffusion and reaction rate model. Computational results show that the He bubbles tend to g...

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Bibliographic Details
Published in:Journal of nuclear materials 2022-12, Vol.572, p.154062, Article 154062
Main Authors: Niu, Chunjie, Lv, Jianhua, Cui, Yunqiu, Liu, Weifeng, Zhao, Zilu, Song, Jiupeng, Chen, Chao, Zhang, Yang, Ni, Weiyuan, Fan, Hongyu, Dai, Shuyu, Lei, Guangjiu, Liu, Dongping
Format: Article
Language:English
Subjects:
He bubble
He+ irradiations
Reaction rate model
W nanofibers
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Summary:The He nanobubbles growth is one of the key factors in affecting surface microstructures of tungsten-based divertor targets. In this work, the growth of He bubbles in W nanofibers has been studied based on He diffusion and reaction rate model. Computational results show that the He bubbles tend to grow rapidly in vicinity of the axis of W nanofibers due to the diffusion and trapping of solute He atoms in W nanofibers while the nanobubbles in W bulk mainly grow in the near-surface layer. Decreasing the radius of W nanofibers and increasing He+ energy can significantly contribute to the growth of the He bubbles in vicinity of the axis of W nanofibers, which has been confirmed by our TEM measurements. The continuous growth of He bubbles in W nanofibers can not only lead to the tensile driven cracking but also the thinning of W nanofibers.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2022.154062