| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Scandium Extraction and Use in Aluminum Alloys
|
| Presentation Title |
Optimizing Al-Mg-Sc-Zr Alloys for Additive Friction Stir Deposition |
| Author(s) |
Maureen Puybras, Véronique Massardier, Matthew Robert Barnett, Michel Perez, Thomas Dorin |
| On-Site Speaker (Planned) |
Thomas Dorin |
| Abstract Scope |
The emerging Additive Friction Stir Deposition (AFSD) technology can create large-scale near-net-shaped aluminium alloy components without the need for melting. However, the scale of AFSD processes often renders post-heat treatments impractical and economically unviable. Currently, there is a lack of aluminium alloys that can achieve high strength without requiring post-heat treatment. This study investigates the use of a solid solution-hardened Al-Mg alloy with additions of slow-diffusing elements, Scandium (Sc) and Zirconium (Zr). Both Al-Mg and Al-Mg-Sc-Zr alloys were prepared using AFSD under various deposition parameters. A heat treatment was first conducted to form Al3(Sc,Zr) precipitates in the Al-Mg-Sc-Zr alloy. EBSD reveals that the grain size of the binary Al-Mg alloy remains largely unaffected by changes in deposition parameters. In contrast, the grain size of the Al-Mg-Sc-Zr alloy increases with higher tool rotation rates. Atom Probe Tomography and Transmission Electron Microscopy indicate that this grain growth is due to the increased dissolution of Al3(Sc,Zr) precipitates at higher tool rotation rates, which promotes grain growth. This work suggests that process parameters can be optimised to prevent the dissolution of Al3(Sc,Zr). The implications of these findings are discussed in the context of developing alloy design strategies tailored for AFSD technology. |
| Proceedings Inclusion? |
Planned: Light Metals |