Hydrogen retention and affecting factors in rolled tungsten: Thermal desorption spectra and molecular dynamics simulations

Hongyu Chen, Lin Wang, Feng Peng, Qiu Xu, Yaoxu Xiong, Shijun Zhao, Kazutoshi Tokunaga, Zhenggang Wu, Yi Ma, Pengqi Chen, Laima Luo, Yucheng Wu

研究成果: ジャーナルへの寄稿学術誌査読

28 被引用数 (Scopus)

抄録

Hydrogen isotope retention of tungsten in nuclear fusion reactors is one of the hot research issues all along. In this paper, tungsten samples in different rolled surfaces were polished by mechanical processing, subsequently subjected to D2+ irradiation and thermal desorption. To better understand the experimental observations, this study also performed molecular dynamics (MD) simulation and investigated the effects of temperature, grain number, grain boundary density, and crystal orientation on hydrogen retention. It is found that the grain number and grain boundary density of rolled tungsten increase successively in RD/TD, RD/ND, and TD/ND surfaces. The RD/ND surface exhibits the best hydrogen radiation resistance, whereas the TD/ND surface is unsatisfactory. MD simulations further indicate that hydrogen retention is more obvious with the increase of grain density in tungsten, and hydrogen atoms are more easily enriched at the grain boundaries. With the increase in temperature, the retention of hydrogen atoms in monocrystalline/polycrystalline tungsten decreases significantly. The average implantation depth of H atoms is deepest along the <111> and <112> crystalline directions, which reveals that hydrogen retention is dependent on the crystal orientations. The good agreement between the experimental data and simulation results reveals that grain boundaries play an important role in hydrogen retention.

本文言語英語
ページ(範囲)30522-30531
ページ数10
ジャーナルInternational Journal of Hydrogen Energy
48
78
DOI
出版ステータス出版済み - 9月 12 2023

!!!All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • 燃料技術
  • 凝縮系物理学
  • エネルギー工学および電力技術

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