Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 21: Interface Controlled Properties, Nanomaterials and Microstructure Design
MM 21.8: Vortrag
Mittwoch, 19. März 2025, 17:30–17:45, H22
Tracking the emergence and persistence of abnormal grain growth in the commercial aluminum alloy AA5252 using 3D X-ray microscopy — •Helmuth-André Schulz-Harder1, Jules M. Dake1, Wolfgang Ludwig2, Haixing Fang2, Pierre-Olivier Autran2, Karolína Gutbrod1, Markus Ziehmer1, Madlen Atzen1, Thomas Wilhelm3, Volker Schmidt3, and Carl E. Krill III1 — 1Institute of Functional Nanosystems, Ulm University, Germany — 2The European Synchrotron (ESRF), Grenoble, France — 3Institute of Stochastics, Ulm University, Germany
The origin of abnormal grain growth (AGG) remains unclear despite decades of investigation, even though this phenomenon has far-reaching implications for a wide range of industrial applications. A significant challenge lies in the scarcity of time-resolved 3D data on AGG. To address this, we acquired a time series of 3D maps of the commercially available aluminum alloy AA5252 using synchrotron-based diffraction-contrast tomography (DCT). The reconstructed grain maps reveal the presence of extreme abnormal grains, the evolution of which could be observed over time and traced back nearly to the point of emergence. To further explore the influence of second-phase particles (known to be present in AA5252) on the growth of abnormal grains, we conducted complementary phase-contrast tomography (PCT) measurements. The combination of these datasets provides new insight into the locations where abnormal grains emerge and the mechanism(s) driving their persistent growth advantage.
Keywords: Abnormal Grain Growth; Microstructural Evolution; Aluminum Alloy; Diffraction Contrast Tomography; Phase Contrast Tomography