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

Research output: Contribution to journalArticlepeer-review

Authors

  • W. Q. Chen
  • X. Y. Wang
  • K. L. Li
  • Y. N. Wang
  • T. W. Morgan
  • And 3 others
  • B. Xu
  • Y. L. Chiu
  • W. Liu

Colleges, School and Institutes

External organisations

  • School of Materials Science and Engineering
  • Tsinghua University
  • DIFFER-Dutch Institute for Fundamental Energy Research

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.

Details

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

Keywords

  • Blister, Hydrogen plasma, Nucleation mechanism, Tungsten