SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 23: Poster II
MM 23.30: Poster
Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2
Time-resolved EBSD investigation of abnormal grain growth in the aluminum alloy AA5252 — •Karolína Holíková1, Jules M. Dake1, Madlen Atzen1, Thomas Wilhelm2, Lukas Petrich2, Orkun Furat2, Volker Schmidt2, Baptiste Flipon3, Marc Bernacki3, and Carl E. Krill III1 — 1Institute of Functional Nanosystems, Ulm University, Germany — 2Institute of Stochastics, Ulm University, Germany — 3MINES ParisTech, PSL University, France
Heat treatment causes changes in the microstructure of polycrystalline materials, with growth of the average grain size being a prominent example. The driving force is the reduction in free energy of the system. When the average grain size increases monotonically with time but the grain size distribution remains self-similar, the process is called normal grain growth (NGG). In contrast, abnormal grain growth (AGG) is characterized by the much faster growth of a few grains at the expense of neighbors, resulting in a bimodal size distribution. Analytic models and computer simulations do a good job of describing NGG, but they generally fail at predicting AGG in real systems--owing to insufficient knowledge of the underlying mechanism(s). If one could observe sequential microstructural changes during AGG, then one might gain a deeper understanding of the phenomenon. To that end, we have investigated grain growth in the aluminum alloy AA5252, which is known to manifest AGG. Time-resolved electron backscatter diffraction (EBSD) measurements reveal abnormal microstructural evolution in 2D, from which we extract clues regarding the underlying mechanism for AGG.