TY - JOUR
T1 - Change of thermal diffusivity and lattice constants of W-5% Re-HfC alloys irradiated in a fission reactor
AU - Fujitsuka, M.
AU - Mutoh, I.
AU - Tanabe, T.
AU - Tsuchiya, B.
AU - Narui, M.
AU - Shikama, T.
AU - Sato, M.
PY - 2002/12/1
Y1 - 2002/12/1
N2 - 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.
AB - 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.
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U2 - 10.1016/S0022-3115(02)01099-1
DO - 10.1016/S0022-3115(02)01099-1
M3 - Article
AN - SCOPUS:0036934409
VL - 307-311
SP - 426
EP - 430
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
IS - 1 SUPPL.
ER -