| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Process-induced Microstructures and Defects
|
| Presentation Title |
F-40: Evolution of Precipitate Structure and Composition as a Function of Heat Input for Additive Friction Stir Deposition of AA7050 |
| Author(s) |
Jacob Strain, Nick Palya, M.Y. Rekha, Paul Allison, Brian Jordon, Luke Brewer |
| On-Site Speaker (Planned) |
Jacob Strain |
| Abstract Scope |
This presentation will highlight the changes in nanoscale precipitate size and composition as a function of heat input for additive friction stir deposition (AFSD) of AA7050. AFSD is a solid-state additive manufacturing process used for material repair and near net shape manufacturing. During AFSD, temperatures can reach 70-90% of the melting point of the material, which when combined with severe plastic deformation cause significant changes to precipitate structure. Three sets of AFSD process parameters were chosen to systematically increase the heat input for deposited material. We are applying electron microscopy and atom probe tomography to track changes to the micro- and nanostructure. STEM-HAADF imaging has shown significant coarsening and changes to the crystalline phases from the substrate to the top of the build. Spatially correlated hardness measurements indicate distinct differences in nanostructure and flow stress between the upper one-third and bottom two-thirds of the builds, regardless of AFSD conditions used. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Aluminum |