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

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

9pp.93 - 97 , 2016-12 , Elsevier Ltd.
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, deu- terium (D) retention in W and W–5% Re samples were examined after irradiation with 6.4 MeV Fe ions at 523–1273 K followed by exposure to D 2 gas at 673 K. 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 ( ≥1073 K), while no significant effects of Re addition was observed after irradiation at 523 K. Irradiation with 20 MeV W ions at room temperature followed by exposure to D plasma at 443–743 K 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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