Ipatova, I., Harrison, Robert W., Terentyev, D., Donnelly, Stephen E. and Jimenez-Melero, E. (2017) Thermal Evolution of the Proton Irradiated Structure in Tungsten–5 wt% Tantalum. Journal of Fusion Energy, 36 (6). pp. 234-239. ISSN 0164-0313

We have monitored the thermal evolution of the proton irradiated structure of W–5 wt% Ta alloy by in-situ annealing in a transmission electron microscope at fusion reactor temperatures of 500–1300 °C. The interstitial-type a/2<111> dislocation loops emit self-interstitial atoms and glide to the free sample surface during the early stages of annealing. The resultant vacancy excess in the matrix originates vacancy-type a/2<111> dislocation loops that grow by loop and vacancy absorption in the temperature range of 600–900 °C. Voids form at 1000 °C, by either vacancy absorption or loop collapse, and grow progressively up to 1300 °C. Tantalum delays void formation by a vacancy-solute trapping mechanism.

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