| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments
|
| Presentation Title |
Phase Transformations Driven by Non-Equilibrium Lattice Point Defects: Fe-based Alloys under Irradiation |
| Author(s) |
Maylise Nastar, Quentin Tencé, Lisa T. Belkacemi, Estelle Meslin, Marie Loyer-Prost |
| On-Site Speaker (Planned) |
Maylise Nastar |
| Abstract Scope |
In alloys with lattice point defects (PDs) in excess, non-coherent phase transformations compete with the formation of PD clusters. For instance, a joint aggregation of self-interstitials and Ni atoms in Fe-Ni under irradiation, yields the precipitation of the unexpected austenite phase in undersaturated ferrite. The competition between PD and solute-PD clustering reactions depends on composition, phase density, temperature and PD supersaturation. To predict the dominant nucleation paths, we introduce the concept of constrained phase diagrams, including axes for non-equilibrium PD concentration. This non-equilibrium concentration results from concurent production, clustering and elimination reactions, thereby depends on the grown-in microstructure and irradiation conditions. By relying on a combined experimental and modeling atomic scale approach, we highlight the role of non-equilibrium PDs on the selection of phases in model alloys of steels and high entropy alloys, and simulate the interplay between second phase precipitation and the formation of dislocation loops and voids. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Nuclear Materials, Phase Transformations |