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Report No.

Effect of alloying element on defects in electron/neutron-irradiated tungsten

Toyama, Takeshi*; Inoue, Koji*; Nagai, Yasuyoshi*; Kinomura, Atsushi*; Suzudo, Tomoaki   ; Hatano, Yuji*

Tungsten (W) is promising as a fusion reactor plasma facing material. Retention and accumulation of hydrogen isotopes become a problem under irradiation, but it was found that the amount of hydrogen isotope accumulation is significantly reduced by the addition of rhenium (Re) and chromium (Cr). This is thought that Re and Cr suppress the formation of vacancy-type defects under irradiation, which are hydrogen trapping sites, but sufficient experimental findings to support this phenomenon have not been obtained yet. The purpose of this study is to apply the positron annihilation method and to investigate the effect of additive elements on the formation of irradiation defects in W alloys under electron beam and neutron irradiation.



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