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

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  • UNIMAN - The University of Manchester
  • DCF - University of Manchester - Dalton Nuclear Institute
  • HudComEng - University of Huddersfield - Computing and Engineering

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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
Publication statusPublished - 11 Nov 2017


  • Refractory metals, Radiation damage , Lattice defects, Annealing, Transmission electron microscopy

ID: 3719927