| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2020
|
| Presentation Title |
CALPHAD Modeling and Microstructure Investigation of Mg-Gd-Y-Zn Alloys |
| Author(s) |
Janet M. Meier, Joshua Caris, Alan A Luo |
| On-Site Speaker (Planned) |
Janet M. Meier |
| Abstract Scope |
In this study, the predictive capabilities of CALPHAD (CALculation of PHAse Diagrams) modeling were used to design and optimize Mg-Gd-Y-Zn alloys containing long period stacking order (LPSO) phases. The selected compositions were evaluated using scanning electron microscopy, electron dispersive spectroscopy, and x-ray diffraction to determine the volume fractions of major phases. It was seen that LPSO 14H formed at the grain boundaries and a filament-type LPSO 14H formed in the Mg grains. As the RE and Zn concentration increased, eutectic Zn rich intermetallics and RE rich phases formed along grain boundaries. With annealing an increase in hardness was observed due to the increase in intermetallic volume fraction, decrease in bulky LPSO volume fraction, and increase in filament-type LPSO. These results indicate the present CALPHAD databases well represent the Mg-Gd-Y-Zn system studied and can be used to tailor the microstructure to potentially improve the strength and ductility in these alloys. |
| Proceedings Inclusion? |
Planned: |