| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium: Accelerated Measurements and Predictions of Thermodynamics and Kinetics for Materials Design and Discovery
|
| Presentation Title |
Modeling of Diffusion and Intermetallic Phase Formation in Al-Mg Bimetallic Structures
|
| Author(s) |
Alan A. Luo |
| On-Site Speaker (Planned) |
Alan A. Luo |
| Abstract Scope |
Aluminum-magnesium (Al-Mg) binary system is the basis of many important Al and Mg alloys. However, it is not well understood for the thermodynamic and atomic-diffusional behaviors in Al-Mg intermetallic compounds (IMCs) which significantly influence the microstructure and performance of Al and Mg alloys. In this presentation, complete and self-consistent thermodynamic and atomic-diffusional databases have been constructed using CALculation of PHAse Diagram (CALPHAD) modeling and experimental data in literature. Based on the above assessment of the Al-Mg system, a low-temperature annealing following overcasting process has been developed to bond magnesium to aluminum alloys. The detailed microstructure evolution during annealing, including the formation and growth of Al-Mg interdiffusion layer and intermetallic phases (Mg17Al12 and Al3Mg2), was experimentally observed and predicted using CALPHAD and diffusion modeling. The precise diffusion modeling in Mg/Al interface provides an efficient way to optimize/control the interfacial microstructure of Mg/Al bimetallic structures for improved interfacial bonding. |
| Proceedings Inclusion? |
Planned: |