| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Elucidating Microstructural Evolution Under Extreme Environments
|
| Presentation Title |
Predictions of Precipitate Morphologies at Dislocations and Grain Boundaries Under Irradiation |
| Author(s) |
Nicholas Saunders, Robert S Averback, Pascal Bellon |
| On-Site Speaker (Planned) |
Nicholas Saunders |
| Abstract Scope |
Under irradiation, precipitates often form at point defect sinks such as grain boundaries and dislocations owing to radiation-induced segregation. New studies have shown that precipitates created by this non-equilibrium process tend to be resistant to coarsening. Motivated by this finding, we model the steady-state morphologies of precipitates at grain boundaries and dislocations in model binary alloys under irradiation. We extend current kinetic Monte Carlo simulations of irradiated alloys to account for the effects of accelerated diffusion within grain boundaries and dislocations. Unlike under equilibrium conditions, where continuous tubular precipitates break up due to the Rayleigh-Plateau instability, we find that these tubes are stabilized under irradiation by increased solute drag towards sinks. Accelerating diffusion along sinks promotes the breakup of continuous precipitates, which is expected since such diffusion is an equilibrium process. Preliminary results from phase-field modeling are also presented to provide a parametric understanding of this behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Nuclear Materials |