About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Synergistic Irradiation, Corrosion, and Microstructural Evolution in Nuclear Materials
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Presentation Title |
Quantifying Radiation Enhanced Diffusion in Model Oxides with Isotopic Tracers and Atom Probe Tomography |
Author(s) |
Kayla Yano, Aaron Kohnert, Tiffany Kaspar, Sandra Taylor, Steven Spurgeon, Hyosim Kim, Yongqiang Wang, Blas Uberuaga, Daniel Schreiber |
On-Site Speaker (Planned) |
Kayla Yano |
Abstract Scope |
Corrosive degradation of structural alloys in reactors is mitigated by thin protective oxide layers that separate the metal from a corrosive media. Irradiation can dramatically affect this protectiveness by generating a non-equilibrium point defect population that fundamentally alters atomistic transport through the irradiated oxide. However the direct impact of irradiation on ion transport is as yet broadly unexplored. In this work embedded isotopic tracers (18O and 57Fe) are used to monitor and quantify atomic transport in model irradiated oxide systems with atom probe tomography. Combining these observations with a chemical-rate theory model provides insights on fundamental transport mechanisms and rates. These results show orders of magnitude increases in anion diffusivity in both proton irradiated hematite and argon irradiated chromia. Preliminary work on Fe cation diffusion, transport across oxide heterolayers, and transport upon phase transformations will also be discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Environmental Effects, Characterization |