TY - JOUR
T1 - Irradiation induced vacamcy-Cu aggregations in Fe-Cu model alloys or reactor pressure vessel steels studied by positron annihilation
AU - Nagai, Yasuyoshi
AU - Takadate, Kazuma
AU - Tang, Zheng
AU - Ohkubo, Hideaki
AU - Hasegawa, Masayuki
PY - 2004/1/1
Y1 - 2004/1/1
N2 - Fe-Cu model alloys (0, 0.05, 0.15, 0.30 and 1.00 wt.%Cu) of Nuclear Reactor Pressure Vessel Steels irradiated by fast neutrons (8.3 × 10 18 n/cm2) at about 100°C are studied by positron annihilation spectroscopy, positron lifetime and coincidence Doppler broadening, in order to analyze the irradiation-induced vacancy-Cu aggregation. We have observed nanovoids (vacancy clusters) whose inner surfaces are covered by Cu atoms in not only high and medium Cu (0.15-1.0 wt.%) alloys but also low Cu (0.05 wt.%) alloys, The typical size of the nanovoids and the fraction of the covering with Cu on the inner surfaces depend on the Cu content. The dissociation of vacancies from the nanovoids by the post-irradiation isochronal annealing at about 400°C leads to the formation of the ultrafine Cu precipitates even for the Fe-0.05wt.%Cu alloy.
AB - Fe-Cu model alloys (0, 0.05, 0.15, 0.30 and 1.00 wt.%Cu) of Nuclear Reactor Pressure Vessel Steels irradiated by fast neutrons (8.3 × 10 18 n/cm2) at about 100°C are studied by positron annihilation spectroscopy, positron lifetime and coincidence Doppler broadening, in order to analyze the irradiation-induced vacancy-Cu aggregation. We have observed nanovoids (vacancy clusters) whose inner surfaces are covered by Cu atoms in not only high and medium Cu (0.15-1.0 wt.%) alloys but also low Cu (0.05 wt.%) alloys, The typical size of the nanovoids and the fraction of the covering with Cu on the inner surfaces depend on the Cu content. The dissociation of vacancies from the nanovoids by the post-irradiation isochronal annealing at about 400°C leads to the formation of the ultrafine Cu precipitates even for the Fe-0.05wt.%Cu alloy.
KW - Coincidence Doppler broadening
KW - Fe-Cu model alloy
KW - Neutron irradiation
KW - Positron lifetime
KW - Post-irradiation annealing
KW - Vacancy-Cu aggregation
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M3 - Conference article
AN - SCOPUS:32944476051
SP - 590
EP - 602
JO - ASTM Special Technical Publication
JF - ASTM Special Technical Publication
SN - 1040-3094
IS - 1447
T2 - Effects of Radiation on Materials: 21st International Symposium
Y2 - 18 June 2002 through 20 June 2002
ER -