About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Nanostructured Materials in Extreme Environments
|
Presentation Title |
Enhanced Corrosion Resistance of Nanostructured Pyrochlore and its Mechanistic Understanding |
Author(s) |
Jie Lian |
On-Site Speaker (Planned) |
Jie Lian |
Abstract Scope |
Pyrochlore A2B2O7 are promising nuclear waste form materials capable of immobilizing actinides and fission products. Nanostructured pyrochlore displays enhanced amorphization resistance when subjected to intensive ion beam irradiations. However, limited knowledge is available in understanding the corrosion kinetics and how different microstructures impact chemical durability when utilized as potential nuclear waste forms in a near field environment. In this work, chemical durability and corrosion mechanisms of nanostructured A2B2O7 are systematically investigated by semi-dynamic leaching testing and solution chemistry analysis, in comparison with micron- or sub-micron sized grain structures. A greatly enhanced corrosion resistance of the nano-sized pyrochlore is discovered and correlated with a transition of corrosion mechanisms leading to rapid precipitation of a titanium-enriched surface passivation film. The mechanistic understanding of the corrosion mechanisms and microstructure impacts will be beneficial to the future design of nanostructured ceramics for actinide incorporation with simultaneously-high radiation and corrosion resistance. |
Proceedings Inclusion? |
Planned: |
Keywords |
Ceramics, Nuclear Materials, Nanotechnology |