|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Applications Utilizing Irradiation and Integrated Modeling
||Analysis of the Oxide Nanoparticles Trapping Behavior in an ODS Eurofer Steel by Means of Positron Annihilation Spectroscopy
||Viviam Marques Pereira, Henk Schut, Jilt Sietsma
|On-Site Speaker (Planned)
||Viviam Marques Pereira
Oxide nanoparticles in ODS steels hinder dislocation and grain boundary movement and trap radiation-induced defects, thus increasing creep and radiation damage resistance. In the present work, the interaction between oxide nanoparticles and defects in a 0.3%-Y2O3 ODS Eurofer steel was assessed, before and after exposure to low-energy D plasma. Samples in a reference state and annealed at 1200 K and 1400 K were first submitted to Positron Annihilation Doppler Broadening and Positron Annihilation Lifetime Spectroscopy. The results obtained for the as-annealed samples suggest that the oxide nanoparticles trap thermal vacancies and, at 1400 K, larger oxide-vacancies clusters form. Then, the same samples were exposed to a low-energy D plasma and measured again with PASDB. The low-energy plasma was chosen to prevent the formation of extra defects. After exposure, the samples presented similar SW values and this can be an indication of D being irreversibly trapped by the oxide-thermal vacancies clusters.