| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Additively Manufactured Materials
|
| Presentation Title |
Studying Microstructure and Stress Corrosion Cracking of an Additive Friction Stir Deposition Processed aa7075 Aluminum Alloy |
| Author(s) |
Ebenezer Acquah, Nilesh Kumar |
| On-Site Speaker (Planned) |
Ebenezer Acquah |
| Abstract Scope |
Additive friction stir deposition (AFSD) is a solid-state process with the potential to produce high-performance materials. This study assesses the microstructure and stress corrosion cracking (SCC) susceptibility of AA7075 aluminum alloy deposited via AFSD. Microstructural evolution was performed using advanced microstructural characterization tools. SCC behavior was studied using slow strain rate tensile (SSRT) testing in a 3.5 wt.% NaCl solution at room temperature, comparing as-processed and post-processing heat treatment (T73) conditions. Tensile testing in the as-processed state was conducted as a function of strain rates. AFSD caused significant grain refinement and SSRT results indicated high SCC susceptibility in the as-processed AA7075 at 10-6 s-1, which was reduced after T73 treatment. TEM analysis showed Cu-rich secondary phases in the as-processed alloy, with Cu content reducing post-T73, lowering SCC susceptibility due to Cu-depletion in the precipitates. These results highlight the role of post-processing heat treatment in improving SCC resistance of AFSD-processed AA7075. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Environmental Effects, Aluminum |