About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Abnormal Grain Growth in Additive Friction Stir Deposited Aluminum Alloys During Heat Treatment |
| Author(s) |
Shane Glasser, Benjamin Pollard, Benjamin Wing, Eric Lass |
| On-Site Speaker (Planned) |
Shane Glasser |
| Abstract Scope |
Additive Friction Stir Deposition (AFSD) is a solid-state additive manufacturing technique that forms homogeneous bulk parts with refined microstructures due to rotational plastic deformation. This results in significant residual stress and anisotropy which are alleviated with standard post-deposition heat treatments. However, these heat treatments have been observed to induce Abnormal Grain Growth (AGG) in cast and forged aluminum alloys (A206, 6061, 7075) processed via AFSD as observed with electron backscatter diffraction. AGG causes a reduction in mechanical properties and creates pathways for intergranular cracking. To understand what conditions cause AGG in AFSD builds; locations with prevalent AGG were investigated in the as deposited condition and after various heat treatments to qualify microstructural evolution and determine temperature ranges sensitive to the phenomenon. The grain characteristics are further compared with an alloy (7020) where this phenomenon is not observed, providing insight into mechanisms of alloy-specific susceptibility during post-deposition heat treatment. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Aluminum, Characterization |