| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
Self-organization of Grain Boundary Precipitate Structures in Irradiated Alloys |
| Author(s) |
Pascal M. Bellon, Sourav Das, Amit Verma, Marie-Agathe Charpagne, Robert S Averback |
| On-Site Speaker (Planned) |
Pascal M. Bellon |
| Abstract Scope |
Past works have established that irradiation can induce the self-organization of phase-separating alloy systems into nanoscale compositional patterns owing to the competition between finite-range ballistic mixing and thermodynamically driven decomposition. Here we extend these studies to include the convective transport of solute to sinks through coupling between solute fluxes and point defect fluxes. Using a phase-field model with grain boundaries (GBs) implemented as arrays of dislocations we find that the competition between solute convection and back thermal diffusion alone can lead to arrested coarsening of the GB precipitates induced by solute drag. A local Peclet number analysis is proposed to rationalize this novel phenomenon. When ballistic mixing is added, these GB structures become stable steady-states, akin to non-equilibrium complexions. The existence and stability of these structures are tested on Al and Ni based alloys subjected to ion irradiation and characterized by correlated transmission electron microscopy and atom probe tomography. |
| Proceedings Inclusion? |
Planned: |