About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Research in Reduced Gravity
|
| Presentation Title |
Lamella-to-rod transition in eutectic solidification: microgravity experiments and phase-field simulations |
| Author(s) |
Mathis O. Plapp, Silvere Akamatsu, Sabine Bottin-Rousseau |
| On-Site Speaker (Planned) |
Mathis O. Plapp |
| Abstract Scope |
The solidification of eutectic alloys generates two-phase composites with lamellar or rod morphologies. Whereas each of these structures has been thoroughly studied, open questions remain concerning the possible transitions between them. It was recently found in experiments on ground and in microgravity (ISS) that lamellae can transform into rods by a dynamic instability that is propagative in nature and leads to repeated pinchoff events at the lamella terminations. This instability is studied in detail by three-dimensional phase-field simulations of a symmetric model alloy. It is found that it occurs only below a critical volume fraction of the minority phase. This critical value of the composition depends on the growth velocity, which is at variance with the usual scaling relations for eutectic coupled growth. The propagation velocity of the instability also depends on the lamellar spacing. The implications of these findings for the interpretation of the experiments are discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Modeling and Simulation, |