[1G15-17] Hydrogen Isotope Retention for Tungsten

[1G16] Effect of irradiation damage on hydrogen isotope retention behavior for tungsten-tantalum alloy

*Shingo Okumura¹, Kaiji Yamamura², Hao Yu², Akira Hasegawa², Ryuta Kasada², Yasuhisa Oya¹ (1. Shizuoka Univ., 2. Tohoku Univ.)

Keywords:Tungsten-Tantalum, hydrogen isotope behavior

For the operation of fusion reactor, it is necessary to consider the irradiation effects by energetic particles such as deuterium (D), tritium (T), and neutrons, as well as the resistance to high heat loads on Tungsten(W) for plasma-facing materials. In this study, powder metallurgical processed polycrystalline Tungsten-1,3,5% Tantalum(W-1,3,5%Ta) samples were used, which have superior recrystallization behavior and strength. The irradiation defects were introduced by 6 MeV Fe²⁺ irradiation and 3 keV deuterium ion irradiation was performed to evaluate the deuterium retention behavior by TDS measurement. For the undamaged W-Ta sample, the deuterium retention was increased as increasing Ta concentration compared to that for W, which would be controlled by hydrogen affinity with Ta.