Irradiation induced vacamcy-Cu aggregations in Fe-Cu model alloys or reactor pressure vessel steels studied by positron annihilation

Yasuyoshi Nagai, Kazuma Takadate, Zheng Tang, Hideaki Ohkubo, Masayuki Hasegawa

研究成果: Conference article査読

4 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)590-602
ページ数13
ジャーナルASTM Special Technical Publication
1447
出版ステータスPublished - 2004 1 1
イベントEffects of Radiation on Materials: 21st International Symposium - Tucson, AZ, United States
継続期間: 2002 6 182002 6 20

ASJC Scopus subject areas

  • 工学(全般)

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