Neutron irradiation tolerance of potassium-doped and rhenium-alloyed tungsten

JOURNAL OF NUCLEAR MATERIALS

卷:553

Article

Nogami, Shuhei¹  Terentyev, Dmitry²  Zinovev, Aleksandr²  Yin, Chao²  Rieth, Michael³  Pintsuk, Gerald⁴  Hasegawa, Akira¹ 

[1] Tohoku Univ, Grad Sch Engn, Dept Quantum Sci & Energy Engn, Aoba Ku, 6-6-01-2 Aramaki Aza Aoba, Sendai, Miyagi 9808579, Japan

[2] SCK CEN, Inst Nucl Mat Sci, Struct Mat Grp, B-2400 Mol, Belgium

[3] Karlsruhe Inst Technol, Inst Appl Mat, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[4] Forschungszentrum Julich, Inst Energy & Climate Res, D-52425 Julich, Germany

关键词: Tungsten;    Potassium doping;    Alloying by rhenium;    Neutron irradiation;    Embrittlement;   

DOI  :  10.1016/j.jnucmat.2021.153009

来源: Elsevier

【 摘 要 】

Tungsten (W) based materials for fusion reactor applications have been developed in Japan for the last decade to improve thermo-mechanical properties and tolerance with respect to neutron-irradiation effects. Potassium (K) doping for dispersion strengthening and alloying by rhenium (Re) for solid solute softening and strengthening were applied to W fabricated by powder metallurgy. Thereby modified W materials, e.g. K-doped W and K-doped W-3%Re, demonstrated a higher recrystallization temperature threshold, an increase in strength and ductility, and a reduction in ductile-to-brittle transition temperature (DBTT) compared to pure W in the non-irradiated state. Embrittlement caused by displacement damage and its amplification due to solid transmutation products is expected to be an intrinsic issue of W based materials under neutron irradiation environment inherent to future fusion reactors. In this paper, the effect of K-doping and alloying by Re on the neutron-irradiation-induced embrittlement of W was investigated at neutron fluence causing a considerable amount of solid transmutation products.& nbsp; (c) 2021 Elsevier B.V. All rights reserved.

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