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Positron annihilation studies of the interaction between oxygen impurities and nanovoids in neutron-irradiated vanadium / Z. Tang in Acta materialia, Vol. 58 N° 5 (Mars 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1868–1875 Titre : Positron annihilation studies of the interaction between oxygen impurities and nanovoids in neutron-irradiated vanadium Type de document : texte imprimé Auteurs : Z. Tang, Auteur ; T. Rewcharoon, Auteur ; Y. Nagai, Auteur Année de publication : 2011 Article en page(s) : pp. 1868–1875 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Positron  annihilation  (PAL)  Radiation  effects  Vacancies  Transition  metals Résumé : Vanadium samples with controlled oxygen impurity of up to 2460 at. ppm were irradiated with fast neutrons to a fluency of View the MathML source 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964540900809X [article] Positron annihilation studies of the interaction between oxygen impurities and nanovoids in neutron-irradiated vanadium [texte imprimé] / Z. Tang, Auteur ; T. Rewcharoon, Auteur ; Y. Nagai, Auteur . - 2011 . - pp. 1868–1875. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1868–1875 Mots-clés : Positron  annihilation  (PAL)  Radiation  effects  Vacancies  Transition  metals Résumé : Vanadium samples with controlled oxygen impurity of up to 2460 at. ppm were irradiated with fast neutrons to a fluency of View the MathML source 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964540900809X