Thermal Evolution of the Proton Irradiated Structure in Tungsten–5 wt% Tantalum

I. Ipatova, R.W. Harrison, Dmitry Terentyev, S.E. Donnelly, E. Jimenez-Melero

    Research outputpeer-review


    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.
    Original languageEnglish
    Pages (from-to)234-239
    Number of pages6
    JournalJournal of Fusion Energy
    Issue number6
    StatePublished - 11 Nov 2017

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