The effects of ion irradiation on the micromechanical fracture strength and hardness of a self-passivating tungsten alloy

Moritz T. Lessmann, Ivan Sudić, Stjepko Fazinić, Tonči Tadić, Aida Calvo, Christopher D. Hardie, Michael Porton, Carmen García-Rosales, Paul M. Mummery

    Research output: Contribution to journalArticlepeer-review

    Abstract

    An ultra-fine grained self-passivating tungsten alloy (W88-Cr10-Ti2 in wt.%) has been implanted with iodine ions to average doses of 0.7 and 7 dpa, as well as with helium ions to an average concentration of 650 appm. Pile-up corrected Berkovich nanoindentation reveals significant irradiation hardening, with a maximum hardening of 1.9 GPa (17.5%) observed. The brittle fracture strength of the material in all implantation conditions was measured through un-notched cantilever bending at the microscopic scale. All cantilever beams failed catastrophically in an intergranular fashion. A statistically confirmed small decrease in strength is observed after low dose implantation (−6%), whilst the high dose implantation results in a significant increase in fracture strength (+9%), further increased by additional helium implantation (+16%). The use of iodine ions as the implantation ion type is justified through a comparison of the hardening behaviour of pure tungsten under tungsten and iodine implantation.

    Original languageEnglish
    Pages (from-to)34-43
    Number of pages10
    JournalJournal of Nuclear Materials
    Volume486
    Early online date29 Dec 2016
    DOIs
    Publication statusPublished - 1 Apr 2017

    Keywords

    • Fracture strength
    • Ion implantation
    • Irradiation effects
    • Micromechanics
    • Self-passivating
    • Tungsten

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