2022/02/13 by Christopher Nellis, Nellis, Christopher, Céline Hin +1
Engineering · Materials Science · #FOS: Physical sciences #Fusion materials and technologies #High-Temperature Coating Behaviors #Materials Science (cond-mat.mtrl-sci) #Nuclear Materials and Properties
paper · pdf · doi:10.48550/arxiv.2202.06189
openalex publication_date 2022/02/13 · openalex created_date 2022/05/05 · openalex updated_date 2026/07/28
A Kinetic Monte Carlo (KMC) model was created to simulate the insertion of transmutation He atoms into nanostructured ferritic alloys (NFAs) under neutron irradiation. Interstitial He atoms migrate through the NFA until becoming trapped in bubbles of other He atoms and vacancies created from irradiation. The Y-Ti-O nano-oxides in the NFAs were found to be effective in capturing these He atoms and preventing bubbles from forming at the grain boundary and appear to replicate the characteristics (size and number density) observed in other experiments. The bubbles were found to prefer the <111> oxide interface as a nucleation site and the stable bubbles have a He/Vac ratio between 1.3 and 1.8 He/Vac. The influence of He bubbles on the segregation of solutes to the grain boundaries or on the stability of the nano-oxides were negligible.