| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium on Thermodynamics of Microstructure Stability and Evolution
|
| Presentation Title |
When grains go wild! Tracking the emergence and persistence of abnormal grain growth in the commercial aluminum alloy 5252 |
| Author(s) |
André Schulz-Harder, Wolfgang Ludwig, Jules M. Dake, Haixing Fang, Pierre-Olivier Autran, Karolína Gutbrod, Markus Ziehmer, Carl E. Krill |
| On-Site Speaker (Planned) |
Carl E. Krill |
| Abstract Scope |
During abnormal grain growth (AGG), a subpopulation of crystallites in a polycrystal takes on a much faster coarsening rate than does the population of neighboring grains, resulting in a microstructure marked by larger, “abnormal” crystallites embedded in a finer-grained “matrix.” In most cases of AGG, neither the emergence of the abnormal grains nor the mechanism by which they persist in consuming the matrix is understood adequately. We have attempted to address these deficits by exploiting diffraction-contrast tomography (DCT) to capture AGG as it occurs in 3D in the commercial aluminum alloy 5252. Not only do grain maps reveal the persistent migration of abnormal/matrix interfaces through a dense array of second-phase pinning particles (mapped by phase-contrast tomography), but also, during the initial stage of annealing, the time-resolved microstructure provides tantalizing clues regarding the emergence of abnormality within the matrix. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Aluminum, Other |