Thermal diffusivity of irradiated tungsten and tungsten-rhenium alloys

JOURNAL OF NUCLEAR MATERIALS

卷:543

Article

Akiyoshi, Masafumi¹  Garrison, Lauren M.²  Geringer, Josina W.²  Wang, Hsin²  Hasegawa, Akira³  Nogami, Shuhei³  Katoh, Yutai² 

[1] Osaka Prefecture Univ, Sakai, Osaka 5998570, Japan

[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[3] Tohoku Univ, Sendai, Miyagi 9808579, Japan

关键词: Thermal diffusivity;    Tungsten material;    Neutron irradiation;    Transmutation;    Lattice defect;   

DOI  :  10.1016/j.jnucmat.2020.152594

来源: Elsevier

【 摘 要 】

The Japan-US PHENIX project irradiated tungsten materials in the RB-19J capsule experiment in the High Flux Isotope Reactor (HFIR). A gadolinium (Gd) shielding was used to absorb the thermal neutrons and reduce rhenium and osmium generation in tungsten. Pure tungsten and K-doped W-3% Re samples were irradiated at 532 - 662 degrees C to dose of 0.21-0.46 dpa, with the grain orientation perpendicular or parallel to the disk surface. Thermal diffusivity measurements were performed from 100 degrees C to 500 degrees C. Additional measurements followed after annealing up to 900 degrees C. Irradiated pure tungsten specimens showed similar thermal diffusivity results compared with an unirradiated W-1% Re specimen in another study. The transmutation amount of Re was calculated to be about 0.52% for those specimens that showed good agreement with this study. Specimens irradiated in this study to different doses presented almost the same thermal diffusivity. Annealing up to 800 degrees C resulted in no recovery of thermal diffusivity. These results show that the contribution of crystalline defects to degradation of thermal diffusivity is quite limited. In addition, the thermal diffusivity of the irradiated specimens was getting close to that of the unirradiated specimens at elevated temperature. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

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