Change of thermal diffusivity and lattice constants of W-5% Re-HfC alloys irradiated in a fission reactor

M. Fujitsuka, I. Mutoh, T. Tanabe, B. Tsuchiya, M. Narui, T. Shikama, M. Sato

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

W-5% Re-HfC alloys with aimed HfC contents of 0.5, 1 and 3 wt% were fabricated by powder metallurgy. Their thermal diffusivity and lattice constant were measured before and after neutron irradiation at 330 K up to a fast neutron (E>1 MeV) fluence of 1×1024 n/m2. Chemical analysis and lattice constant measurements revealed that Hf existed not as HfC but mainly as a solute in the alloys. The thermal diffusivity of the alloys with HfC less than 1% nominal content was higher than that of W-5% Re, specifically at higher temperatures, while the diffusivity of the alloy with 3% HfC (nominal content) was lower than that of W-5% Re. Only the alloy with 3% HfC showed a distinct decrease of the thermal diffusivity after neutron irradiation and its recovery after annealing. The lattice constants of the W-5% Re alloys increased with the increase of the Hf content. Only the lattice constant of the alloy with 3% HfC represented a considerable increase after neutron irradiation.

Original languageEnglish
Pages (from-to)426-430
Number of pages5
JournalJournal of Nuclear Materials
Volume307-311
Issue number1 SUPPL.
DOIs
Publication statusPublished - 2002 Dec 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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    Fujitsuka, M., Mutoh, I., Tanabe, T., Tsuchiya, B., Narui, M., Shikama, T., & Sato, M. (2002). Change of thermal diffusivity and lattice constants of W-5% Re-HfC alloys irradiated in a fission reactor. Journal of Nuclear Materials, 307-311(1 SUPPL.), 426-430. https://doi.org/10.1016/S0022-3115(02)01099-1