Nuclear Materials and Energy (Dec 2016)

Deuterium retention in W and W-Re alloy irradiated with high energy Fe and W ions: Effects of irradiation temperature

  • Y. Hatano,
  • K. Ami,
  • V.Kh. Alimov,
  • S. Kondo,
  • T. Hinoki,
  • T. Toyama,
  • M. Fukuda,
  • A. Hasegawa,
  • K. Sugiyama,
  • Y. Oya,
  • M. Oyaidzu,
  • T. Hayashi

DOI
https://doi.org/10.1016/j.nme.2016.06.016
Journal volume & issue
Vol. 9, no. C
pp. 93 – 97

Abstract

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Neutron irradiation to W induces defects acting as traps against hydrogen isotopes and transmutation elements such as Re and Os. To investigate synergetic effects on radiation-induced defects and Re, deuterium (D) retention in W and W–5% Re samples were examined after irradiation with 6.4MeV Fe ions at 523–1273K followed by exposure to D2 gas at 673K. The value of D retention in W–5% Re was lower than that in W by orders of magnitude after the irradiation at high temperatures (≥1073K), while no significant effects of Re addition was observed after irradiation at 523K. Irradiation with 20MeV W ions at room temperature followed by exposure to D plasma at 443–743K also resulted in small difference in D retention between W and W–5% Re samples. The results of positron lifetime measurements showed that the reduced D retention by Re observed after high temperature irradiation was due to suppression of formation of vacancy-type defects (monovacancies and vacancy clusters) by Re.

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