|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Late News Poster Session
||O-24: Radiation Enhanced Diffusion Along Fast Pathways in Model Oxides
||Kayla Yano, Tiffany C. Kaspar, Aaron A. Kohnert, Hyosim Kim, Yongqiang Wang, Blas P. Uberuaga, Daniel K Schreiber
|On-Site Speaker (Planned)
Corrosive degradation of structural alloys in reactors is mitigated by thin protective oxide layers that separate the metal from a corrosive media. However, irradiation produces a population of non-equilibrium point defects that fundamentally alter transport through the irradiated oxide matrix. Two dimensional defects, such as grain boundaries that terminate at the surface, serve as fast diffusion pathways for oxide ingress. The extent to which these pathways enhance transport under irradiation is yet broadly unexplored. In this work embedded isotopic tracers (18O and 57Fe) are used to monitor and quantify atomic transport in irradiated polycrystalline model oxide systems with atom probe tomography. In combination, a chemical rate-theory model provides insight on fundamental transport mechanisms and rates. In this Late News Poster session, results will be delivered on a Fe2O3-Cr2O3 bi-layer system, where previous studies have shown orders of magnitude increases in anion and cation diffusivity in argon irradiated bulk oxides.
||Nuclear Materials, Characterization, Environmental Effects