Positron annihilation studies of the interaction between oxygen impurities and nanovoids in neutron-irradiated vanadium

Z. Tang, T. Rewcharoon, Yasuyoshi Nagai, M. Hasegawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Vanadium samples with controlled oxygen impurity of up to 2460 at. ppm were irradiated with fast neutrons to a fluency of 8.3 × 1018 n cm- 12 at 150 °C. The irradiation-induced nanovoids and the interaction between the defects and the oxygen impurities are studied systematically by combining the positron lifetime technique, the coincidence Doppler broadening technique and the first-principles calculations. The nanovoids are seen to be decorated with the oxygen impurities, which play a significant role in the dynamic processes of the formation of the nanovoids by irradiation and their subsequent recovery by post-irradiation annealing. The decoration with oxygen impurities not only enhances the nanovoid formation but also stabilizes them during low-temperature annealing (<400 °C). The oxygen impurities dissociate from the nanovoids by annealing above 400 °C and the irradiation-induced nanovoids recover on the annealing at 650 °C.

Original languageEnglish
Pages (from-to)1868-1875
Number of pages8
JournalActa Materialia
Volume58
Issue number5
DOIs
Publication statusPublished - 2010 Mar 1

Keywords

  • Positron annihilation (PAL)
  • Radiation effects
  • Transition metals
  • Vacancies

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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