Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 545, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2020.152724
Keywords
ODS-EUROFER steel; Ion implantation; TEM; Helium; Cavities; Swelling; Bubble-to-void transition; Modeling
Funding
- Vernadskiy program of French embassy in Moscow
- Universite Paris-Sud
- Governmental Support of Competitive Growth Program of NRNU MEPhI [02.0 03.21.0 0 05]
- Euratom research and training programme 2014-2018 [633053]
- Euratom research and training programme 2019-2020 [633053]
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The study showed that different injection modes in ODS-EUROFER steel have varying effects on bubble formation and radiation stability, with nanoparticles potentially leading to a bubble-to-void transition. Quantitative assessment of bubble families can help prevent swelling acceleration.
The paper deals with a detailed study of He-filled cavity ensemble development in ODS-EUROFER steel implanted with 10 keV helium ions to a high peak concentration of 8.5 x 10(3) appm both with and without simultaneous irradiation with 4 MeV gold ions, which allowed us to strongly vary the ratios of dpa/He introduction. The subsequent transmission electron microscopy examination reveals excellent radiation stability of He-implanted sample in the single-beam implantation mode. In contrast, after the simultaneous dual-beam irradiation a bubble-to-void transition was observed for bubbles that were associated with yttria nanoparticles. The relative importance of different He bubble families observed in the He-implanted samples for the swelling accumulation is quantitatively assessed, emphasizing the potential risks of abrupt swelling acceleration in the case of bubble-to-void transition launched by nanoparticles. A model of bubble-to-void transition for gas bubbles associated with spherical second-phase particles is developed and used to rationalize experimental observations. (C) 2020 EURATOM. Published by Elsevier B.V. All rights reserved.
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