The recovery of gas-vacancy-complexes in Fe irradiated with high energy H or He ions

Toshitaka Ishizaki, Qiu Xu, Toshimasa Yoshiie, Shinji Nagata

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)9-12
Number of pages4
JournalMaterials Transactions
Issue number1
Publication statusPublished - 2004 Jan


  • Gas-vacancy complex
  • Helium
  • Hydrogen
  • Ion irradiation
  • Iron
  • Microvoids
  • Positron annihilation spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'The recovery of gas-vacancy-complexes in Fe irradiated with high energy H or He ions'. Together they form a unique fingerprint.

Cite this