About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Additive Manufacturing of Metals: Multiscale and Non-Equilibrium Solidification Fundamentals
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| Presentation Title |
On the occurrence of rapid solidification during laser powder-bed fusion of metallic alloys |
| Author(s) |
Damien Tourret, Jonah Klemm-Toole, Adriana Eres Castellanos, Amy Clarke, Alain Karma, Rouhollah Tavakoli, Adrian Boccardo, Muzi Li, Jon Molina, Javier Llorca |
| On-Site Speaker (Planned) |
Damien Tourret |
| Abstract Scope |
Laser powder bed fusion (LPBF) is often described as a rapid solidification process due to high cooling rates. However, clear signatures of far-from-equilibrium solidification – e.g., solute trapping, kinetic undercooling, or morphological transitions – are not systematic. We present recent studies combining experiments, theory, and phase-field simulations to investigate the formation of far-from-equilibrium microstructures in metallic systems. In laser spot melting of single-crystal Ni alloys, in situ X-ray imaging reveals solidification velocities exceeding classical stability limits, yet yielding branchless <100>-oriented dendrites – suggesting only modest deviations from equilibrium. In contrast, LPBF-printed WE43 Mg alloy exhibits banded microstructures with alternating solute-segregated and featureless regions, a hallmark of banding instabilities near planar interface restabilization velocities, as reproduced by simulations. These findings prompt a reassessment of when and where rapid solidification truly governs microstructure evolution in metal additive manufacturing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Solidification, |