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MM: Fachverband Metall- und Materialphysik

MM 15: Poster session I

MM 15.7: Poster

Montag, 7. März 2016, 18:00–20:00, Poster B3

Probing texture-induced abnormal grain growth in polycrystalline materials in 4D — •Mingyan Wang, Jules Dake, Anton Manin, and Carl Krill — Institute of Micro and Nanomaterials, Ulm University, Germany

Although abnormal grain growth (AGG) has been investigated in polycrystalline materials for more than 70 years, our understanding of the underlying mechanisms remains incomplete. Conventional studies based on micrographs cannot capture the real physical processes that take place in 3D. Instead, a non-destructive 3D characterization method is needed to probe these phenomena. Employing three-dimensional x-ray diffraction (3DXRD) microscopy, we were able to collect a sequence of microstructural snapshots, which could then be combined into a full 4D (3D + time) dataset. Analysis of particle trajectories show that a subpopulation of grains grows much faster than expected, indicating the occurrence of AGG. Comparing the microstructural evolution in our sample to a simulation of normal grain growth, we find large discrepancies in coarsening behavior. By extending a 3D phase field simulation to include texture-dependent grain boundary properties, we achieve much better agreement with the measured changes in grain size and morphology.