| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification Science VIII
|
| Presentation Title |
Numerical Model of Al-33wt%Cu Eutectic Growth during Impulse Atomization |
| Author(s) |
Jonas Valloton, Abdoul-Aziz Bogno, Michel Rappaz, Hani Henein |
| On-Site Speaker (Planned) |
Jonas Valloton |
| Abstract Scope |
Rapid solidification of Al-Cu droplets of eutectic composition was carried out using Impulse Atomization. Two distinct morphologies were observed: an irregular undulated eutectic assumed to form during recalescence, followed by a regular lamellar eutectic. The volume fraction of each morphology was measured and nucleation undercooling was deduced using the hypercooling limit. A model of the eutectic solidification was developed assuming that the kinetics of the undulated and regular regions is the same and follows scaling laws established experimentally. The simulated solid fraction forming during recalescence matches the experimental undulated eutectic fraction. Furthermore, the heat balance confirms the adiabatic nature of the solidification during recalescence. Good agreement is found between the model and experimental measurements of lamellar spacing for the regular eutectic. However, the predicted spacing of the undulated zone is much lower than what is observed experimentally. This is attributed to coarsening induced by the latent heat released during recalescence. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Modeling and Simulation, |