The influence of carbon impurities on the formation of loops in tungsten irradiated with self-ions

N. Castin, A. Dubinko, G. Bonny, A. Bakaev, J. Likonen, A. De Backer, Andrea Elisabet Sand, Kalle Heinola, D. Terentyev

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The microstructure changes taking place in W under irradiation are governed by many factors, amongst which C impurities and their interactions with self-interstitial atoms (SIA). In this work, we specifically study this effect by conducting a dedicated 2-MeV self-ions irradiation experiment, at room temperature. Samples were irradiated up to 0.02, 0.15 and 1.2 dpa. Transmission electron microscopy (TEM) expectedly revealed a large density of SIA loops at all these doses. Surprisingly, however, the loop number density increased in a non-monotonous manner with the received dose. Performing chemical analysis with secondary ion spectroscopy measurements (SIMS), we find that our samples were likely contaminated by C injection during the irradiation. Employing an object kinetic Monte Carlo (OKMC) model for microstructure evolution, we demonstrate that the C injection is the likely factor explaining the evolution of loops number density. Our findings highlight the importance of the well-known issue of C injection during ion irradiation experiments, and demonstrate how OKMC models can help to rationalize this effect.
Original languageEnglish
JournalJournal of Nuclear Materials
DOIs
Publication statusPublished - 15 Dec 2019
MoE publication typeA1 Journal article-refereed

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