| Titre : | Positron annihilation studies of the interaction between oxygen impurities and nanovoids in neutron-irradiated vanadium (2011) |
| Auteurs : | Z. Tang, Auteur ; T. Rewcharoon, Auteur ; Y. Nagai, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Acta materialia (Vol. 58 N° 5, Mars 2010) |
| Article en page(s) : | pp. 1868–1875 |
| Note générale : | Métallurgie |
| Langues : | Anglais |
| Tags : | 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 |
