Materials Transactions Online

Materials Transactions, Vol.45 No.01 (2004) pp.9-12
© 2004 The Japan Institute of Metals

The Recovery of Gas-Vacancy-Complexes in Fe Irradiated with High Energy H or He Ions

Toshitaka Ishizaki1,, Qiu Xu1, Toshimasa Yoshiie1 and Shinji Nagata2

1Research Reactor Institute, Kyoto University, Kumatori-cho, Osaka 590-0494, Japan
2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Isochronal annealing experiments for Fe irradiated with H or He ions were carried out to study interactions between gas atoms and vacancy clusters. The accelerating energy of H and He ions was 1.0 MeV and 3.3 MeV, respectively. The total dose was 1.0× 1021 H ions/m2 (0.2 dpa) and 9.6× 1019 He ions/m2 (0.3 dpa), and the irradiation temperature was 300°C. Positron annihilation lifetime and coincidence Doppler broadening (CDB) measurements were carried out after irradiation and annealing for 1 hour up to the complete recovery temperature. Microvoids were detected after H or He ion irradiation. The characteristic difference was mainly shown in the recovery of vacancy type defects. The recovery of vacancy type defects introduced by H ion irradiation finished completely at 450°C, while that by He ion irradiation finished at 1000°C. It suggests that H-vacancy complexes were less stable than He-vacancy complexes. In addition, vacancy clusters formed by He ion irradiation grew after annealing at 600°C. This was caused by the emission of He atoms from small He-vacancy clusters and the coalescence between free vacancies and vacancy clusters, and by the migration and coalescence of He bubbles.

(Received 2003/7/25; Accepted 2003/10/22)

Keywords: iron, hydrogen, helium, ion irradiation, positron annihilation spectroscopy, microvoids, gas-vacancy complex

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