| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2020
|
| Presentation Title |
Insights on Solidification of Mg and Mg-Al Alloys by Large Scale Atomistic Simulations |
| Author(s) |
Mohsen Asle Zaeem, Avik Mahata, Sepideh Kavousi |
| On-Site Speaker (Planned) |
Sepideh Kavousi |
| Abstract Scope |
Solid-liquid interface properties and rapid directional solidification of Mg and Mg-Al alloys are studied by large scale molecular dynamics (MD) simulations. Second nearest neighbor modified embedded atom method (2NN-MEAM) interatomic potentials are utilized to describe the atomic interactions at high temperatures. The anisotropy of the hexagonal close-packed (HCP)-liquid interface free energy is studied utilizing the capillary fluctuation method, and the solid–liquid coexisting approach is used to accurately determine the melting point and melting properties. The first preferred dendrite growth direction in solidification of Mg is predicted as [112-0], which is in agreement with experiments. At the initial stages of rapid directional solidification, several solidification defects such as twins and stacking faults form. As directional solidification progresses, grains elongate along the solidification direction and form a few layers with lamellar like structures. The directional solidification in Mg-Al alloys consists of considerable amount of heterogeneities including formation of Mg17Al12 precipitates. |
| Proceedings Inclusion? |
Planned: |