| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification Science VIII
|
| Presentation Title |
Dendritic Spacing Selection during Al-Cu Casting: Experiments and Multiscale Simulations |
| Author(s) |
Barbara Bellon, Ahmed K. Boukellal, Thomas Isensee, John Coleman, Matthew J.M. Krane, Michael S. Titus, Damien Tourret, Javier Llorca |
| On-Site Speaker (Planned) |
Javier Llorca |
| Abstract Scope |
Dendrite arm spacings have a strong effect on the mechanical properties of cast microstructures. Spacing selection during solidification can be simulated using phase-field. However, three-dimensional quantitative simulations are challenging, in particular for non-dilute alloys, due to the wide separation of scale between dendritic tips and diffusion. For this reason: (1) comparisons of simulations and experiments have mostly focused on thin-sample experiments of dilute alloys and (2) in practice, spacings are typically estimated using phenomenological power laws of the process and alloy parameters. Here, we use phase-field simulations for dilute alloys, and extend them to higher concentrations using a dendritic needle network approach, in order to predict primary spacings in Al-Cu alloys. We compare simulation results to measurements from casting experiments and literature data, and show that this multiscale approach can provide a quantitative predictions of local microstructure length scales in bulk samples solidified under realistic casting conditions. |
| Proceedings Inclusion? |
Planned: |