Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5454209 | Journal of Nuclear Materials | 2017 | 10 Pages |
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 7Â dpa, as well as with helium ions to an average concentration of 650Â appm. Pile-up corrected Berkovich nanoindentation reveals significant irradiation hardening, with a maximum hardening of 1.9Â 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 (â6%), 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.
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Authors
Moritz T. Lessmann, Ivan SudiÄ, Stjepko FaziniÄ, TonÄi TadiÄ, Aida Calvo, Christopher D. Hardie, Michael Porton, Carmen GarcÃa-Rosales, Paul M. Mummery,