کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1448254 988668 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Positron annihilation studies of the interaction between oxygen impurities and nanovoids in neutron-irradiated vanadium
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Positron annihilation studies of the interaction between oxygen impurities and nanovoids in neutron-irradiated vanadium
چکیده انگلیسی

Vanadium samples with controlled oxygen impurity of up to 2460 at. ppm were irradiated with fast neutrons to a fluency of 8.3×1018ncm-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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 58, Issue 5, March 2010, Pages 1868–1875
نویسندگان
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