Mechanical and microstructural changes in tungsten due to irradiation damage

Uytdenhouwen, Inge; Coenen, J. W.; Wirtz, Marius; Schwarz-Selinger, T.

doi:10.1088/0031-8949/T167/1/014007

Journal Article

FZJ-2017-05333

Mechanical and microstructural changes in tungsten due to irradiation damage

Uytdenhouwen, I. (Corresponding author) ; Schwarz-Selinger, T. ; Coenen, J. W.FZJ* ; Wirtz, M.FZJ*

2016
IoP Publ. Bristol

Physica scripta T167, 014007 - (2016) [10.1088/0031-8949/T167/1/014007]

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Please use a persistent id in citations: doi:10.1088/0031-8949/T167/1/014007

Abstract: Stress-relieved pure tungsten received three damage levels (0.10, 0.25 and 0.50 dpa) by self-tungsten ion beam irradiation at room temperature. Positron annihilation spectroscopy showed the formation of mono-vacancies and vacancy clusters after ion beam exposure. In the first irradiation step (0–0.10 dpa) some splitting up of large vacancy clusters occurred which became more numerous. For increasing dose to 0.25 dpa, growth of the vacancy clusters was seen. At 0.50 dpa a change in the defect formation seems to occur leading to a saturation in the lifetime signal obtained from the positrons. Nano-indentation on the cross-sections showed a flat damage depth distribution profile. The nano-indentation hardness increased for increasing damage dose without any saturation up to 0.50 dpa. This means that other defects such as dislocation loops and large sized voids seem to contribute.

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