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- W2066637812 abstract "The defect structures in deformed and helium-irradiated refractory metals, vanadium, niobium and tantalum have been investigated by means of positron lifetime and Doppler broadening techniques. The evolution of the defects was studied by performing isochronal annealing programmes. In all three metals after deformation a single, well defined lifetime was observed which was 30 ps to 40 ps lower than that reported for vacancies. The recovery of the deformation-induced defects however, is remarkably different for niobium and tantalum as compared to vanadium. In helium-irradiated vanadium and niobium two distinctly different defect types were observed with characteristic lifetimes of about 190 ps and 375 ps, respectively. The longer lifetime is attributed to large helium bubbles. Both metals showed a similar behaviour in the annealing studies. All measured lifetime data are consistent with the simple trapping model. The influence of oxygen impurities and oxygen resorption during the isochronal annealing procedure is discussed." @default.
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- W2066637812 date "1993-06-07" @default.
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- W2066637812 title "Investigation of defect structures in deformed and helium-irradiated refractory metals by positron annihilation" @default.
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- W2066637812 doi "https://doi.org/10.1088/0953-8984/5/23/026" @default.
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