| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Ceramics for a New Generation of Nuclear Energy Systems and Applications
|
| Presentation Title |
A Physics-Based Cluster Dynamics Model of Radiation-Enhanced Growth of Oxides |
| Author(s) |
Aaron Kohnert, Edward Holby, Amitava Banerjee, Shivani Srivastava, Mark Asta, Blas P. Uberuaga |
| On-Site Speaker (Planned) |
Blas P. Uberuaga |
| Abstract Scope |
Materials intended for nuclear environments can experience a number of harsh conditions, including irradiation and corrosion. There is still relatively little known about how radiation-induced defects impact the corrosive growth of oxides. To remedy this gap, we have developed a cluster dynamics model that accounts for radiation-enhanced diffusion, the variability in charge states of defects as a function of the local electronic structure of the material, and the formation of space-charge regions that create electric fields and thus induce electromigration. Using this model, we demonstrate the impact of radiation damage on Fe2O3 hematite, where the defect thermokinetic parameters are determined using density functional theory and reproduce thermal oxide growth behavior. We find that irradiation has a large effect on oxide growth rates and that complex defect profiles evolve across the oxide. This work emphasizes the synergies between irradiation and corrosion. |