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

Authors
Journal
Acta Materialia
1359-6454
Publisher
Elsevier
Publication Date
Volume
58
Issue
5
Identifiers
DOI: 10.1016/j.actamat.2009.11.030
Keywords
  • Positron Annihilation (Pal)
  • Radiation Effects
  • Vacancies
  • Transition Metals

Abstract

Abstract Vanadium samples with controlled oxygen impurity of up to 2460 at. ppm were irradiated with fast neutrons to a fluency of 8.3 × 10 18 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.

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