Nucleation mechanism of intra-granular blisters in tungsten exposed to hydrogen plasma

W. Q. Chen, X. Y. Wang (Corresponding author), K. L. Li, Y. N. Wang, T. W. Morgan, B. Xu, Y. L. Chiu (Corresponding author), W. Liu (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Despite being a subject of long-term research on fusion-reactor structural materials, the behaviour of hydrogen in tungsten under plasma exposure remains unclear. Here, the explicit transmission electron microscopy observations for recrystallised W after hydrogen plasma exposure are successfully obtained. These are the first observations to show the intra-granular blisters are located on the {100} planes. Molecular dynamics simulations confirm the hydrogen blister initiating at <100> dislocation core behaved similarly to those in experiment. We propose that the widely reported intra-granular hydrogen blisters are nucleated at the <100> edge dislocation core and develop along the (100) plane in tungsten.

Original languageEnglish
Pages (from-to)243-249
Number of pages7
JournalScripta Materialia
Volume187
DOIs
Publication statusPublished - Oct 2020

Keywords

  • Blister
  • Hydrogen plasma
  • Nucleation mechanism
  • Tungsten

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