Structural defect accumulation in tungsten and tungsten-5wt.%tantalum under incremental proton damage

Research output: Contribution to journalArticle


  • L. Ipatova
  • Robert W. Harrison
  • P.T. Wady
  • S.M. Shubeita
  • Dmitry Terentyev
  • Stephen E. Donnelly
  • Enrique Jimenez-Melero

Institutes & Expert groups

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

Documents & links


We have performed proton irradiation ofWand W-5wt.%Ta materials at 350 C with a step-wise damage level increase up to 0.7 dpa and using two beam energies, namely 40 keV and 3 MeV, in order to probe the accumulation of radiation-induced lattice damage in these materials. Interstitial-type a/2 dislocation loops are formed under irradiation, and their size increases in W-5Ta up to a loop width of 21 ± 4 nmat 0.3 dpa, where loop saturation takes place. In contrast, the loop length in W increases progressively up to 183 ± 50 nm at 0.7 dpa, whereas the loop width remains relatively constant at 29 ± 7nmat >0.3 dpa, giving rise to dislocation strings. The dislocation loops and tangles are observed in both materials examined after a 3 MeV proton irradiation at 350 C. Ta doping delays the evolution of radiation-induced dislocation structures in W, and can consequently impact the hydrogen isotope retention under plasma exposure.


Original languageEnglish
Pages (from-to)329-335
Number of pages7
JournalJournal of Nuclear Materials
Publication statusPublished - 1 Apr 2018


  • Refractory metals, Binary alloys, Dislocation analysis, Proton irradiation, Transmission electron microscopy

ID: 5194097