Effect of helium irradiation on deuterium permeation behavior in tungsten

JOURNAL OF NUCLEAR MATERIALS

卷:490

Article

Uemura, Yuki¹  Sakurada, Shodai¹  Fujita, Hiroe¹  Azuma, Keisuke¹  Zhou, Quilai¹  Hatano, Yuji²  Yoshida, Naoaki³  Watanabe, Hideo³  Oyaizu, Makoto⁴  Isobe, Kanetsugu⁴  Shimada, Masashi⁵  Buchenauer, Dean⁶  Kolasinski, Robert⁶  Chikada, Takumi¹  Oya, Yasuhisa¹ 

[1] Shizuoka Univ, Grad Sch Sci & Technol, 836 Ohya, Shizuoka 4228529, Japan

[2] Univ Toyama, Hydrogen Isotope Res Ctr, 3190 Gofuku, Toyama 9308555, Japan

[3] Kyushu Univ, Inst Appl Mech, 6-1 Kasuga Koen, Fukuoka 8168580, Japan

[4] Natl Inst Quantum & Radiol Sci & Technol, 2166 Obuchi, Aomori 0393212, Japan

[5] Idaho Natl Lab, 1955 N Fremont Ave, Idaho Falls, ID 83415 USA

[6] Sandia Natl Labs, Chem Combust & Mat Ctr, Livermore, CA 94550 USA

关键词: Tungsten;    Hydrogen isotope permeation;    Helium irradiation;    Helium bubble;   

DOI  :  10.1016/j.jnucmat.2017.04.041

来源: Elsevier

【 摘 要 】

In this study, we measured deuterium (D) gas-driven permeation through tungsten (W) foils that had been pre-damaged by helium ions (He+). The goal of this work was to determine how ion-induced damage affects hydrogen isotope permeation. At 873 K, the D permeability for W irradiated by 3.0 keV He+ was approximately one order of magnitude lower than that for un-damaged W. This difference diminished with increasing temperature. Even after heating to 1173 K, the permeability returned to less than half of the value measured for un-damaged W. We propose that this is due to nucleation of He bubbles near the surface which potentially serve as a barrier to diffusion deeper into the bulk. Exposure at higher temperatures shows that the D permeability and diffusion coefficients return to levels observed for undamaged material. It is possible that these effects are linked to annealing of defects introduced by ion damage, and whether the defects are stabilized by the presence of trapped He. (C) 2017 Elsevier B.V. All rights reserved.

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