About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification X
|
| Presentation Title |
Phase-field insights into microstructure morphology selection in rapid solidification of metallic alloys |
| Author(s) |
José Mancias, Raymundo Arróyave, Damien Tourret |
| On-Site Speaker (Planned) |
Damien Tourret |
| Abstract Scope |
Why do some alloys exhibit an oscillatory “banding” regime during rapid solidification while others do not? What microstructure forms during the transition from dendritic/cellular to planar when banding is absent? To answer these questions, we use a quantitative phase-field model that captures solute trapping and kinetic undercooling across the full velocity range. Focusing first on Fe-Cr, which does not exhibit banding, we apply Bayesian active learning to efficiently map morphology transitions across growth velocity, thermal gradient, and composition. Our results demonstrate the efficiency of Bayesian-guided phase-field simulations in navigating high-dimensional parameter spaces and reveal the presence of unstable microstructures in the dendritic-to-planar transition. We then conduct a parametric study of banding onset in Fe-Cr, Al-Cu, and Ni-Nb systems, identifying the critical influence of the interface kinetic coefficient and surface energy anisotropy on banding behavior. This work provides mechanistic insights into microstructure selection under far-from-equilibrium conditions relevant to additive manufacturing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Modeling and Simulation, |