About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
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Computational Thermodynamics and Kinetics
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Presentation Title |
Computational simulations of rapid solidification during additive manufacturing of a Magnesium alloy |
Author(s) |
Damien Tourret, Rouhollah Tavakoli, Adrian Boccardo, Ahmed Kaci Boukellal, Muzi Li, Jon Molina, Javier LLorca |
On-Site Speaker (Planned) |
Damien Tourret |
Abstract Scope |
Laser powder-bed fusion (LPBF) is often considered a rapid solidification process due to the high cooling rates involved. However, unambiguous signatures of far-from-equilibrium solidification (e.g. solute trapping, kinetic undercooling, or morphological transitions) are scarce. Unequivocal rapid solidification “banded” microstructures were identified in LPBF-printed samples of biomedical WE43 Mg alloy. Here, we use computational simulations to study the evolution of the solid-liquid interface leading to the emergence of these banded microstructures. To do so, we combine thermal simulations at the melt pool scale with microscopic phase-field simulations of far-from-equilibrium rapid solidification. Our simulations confirm that LPBF conditions promote the formation of banded microstructures. The underlying mechanism is confirmed as the burgeoning instability of dendrite tips, here primarily originating from dendritic sidebranches. The quantitative correlation of microstructures with local solidification conditions should ultimately play a key role in the design of 3D-printed biomedical implants with locally tuned mechanical and corrosion properties. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, Additive Manufacturing, Magnesium |