| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Computational Thermodynamics and Kinetics
|
| Presentation Title |
O-6: Computational Study of the Structure and Thermodynamics of GP Zones in Mg Alloys |
| Author(s) |
Kang Wang, Du Cheng, Bi-Cheng Zhou |
| On-Site Speaker (Planned) |
Bi-Cheng Zhou |
| Abstract Scope |
Recent experimental studies have found that GP zones (nanometer-sized solute clusters) formed during early stage aging process in Mg alloys can significantly enhance their strength while retaining high ductility. However, the structure and thermodynamics of GP zones in Mg alloys were poorly studied, which hinders a coherent alloy design strategy. In the present study, we used first-principles calculations, cluster expansion, and Monte Carlo simulations to study the metastable orderings on the hcp lattice and structures and stability of GP zones in Mg-Sn and Mg-Zn alloys, which are the only known binary, rare-earth-free GP-zone forming systems in Mg alloys. Numerous potential GP zone structures in Mg-Sn and Mg-Zn alloys are predicted and metastable phase diagrams are constructed. Our calculations also suggest new metastable precipitation sequences in Mg-Sn and Mg-Zn systems. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |