Berlin 2024 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 29: Poster II
MM 29.32: Poster
Dienstag, 19. März 2024, 17:00–19:00, Poster B
A journey from 2D into the third dimension of abnormal grain growth in the aluminum alloy AA5252 — •Helmuth-André Schulz-Harder1, Karolína Gutbrod1, Jules M. Dake1, Madlen Atzen1, Markus Ziehmer1, Baptiste Flipon2, Marc Bernacki2, Pierre-Olivier Autran3, Wolfgang Ludwig3, and Carl E. Krill III1 — 1Institute of Functional Nanosystems, Ulm University, Germany — 2MINES ParisTech, PSL University, France — 3ESRF, France
The physics of grain growth are governed by thermodynamics. When the interface area between neighboring crystallites changes, the free energy F changes as well, which then acts as a driving force for the migration of grain boundaries. Under certain conditions, this can cause a subset of grains to start growing abnormally at the cost of neighboring grains. Although abnormal grain growth (AGG) has been investigated for decades, the underlying mechanisms are still not fully understood. We have investigated AGG in the aluminum alloy AA5252 using electron backscatter diffraction (EBSD), which is a 2D method. The results showed that the occurrence of AGG depends strongly on heating conditions, but because grain growth is a three-dimensional process, only 3D investigations can give a complete picture of the process. Therefore, diffraction contrast tomography (DCT) and phase contrast tomography (PCT) measurements were performed with synchrotron radiation to obtain 3D time-resolved datasets of microstructural evolution and insight into the role played in AGG by second-phase particles.
Keywords: Abnormal grain growth; Microstrustructural evolution; Al alloy; Diffraction contrast tomography; Phase contrast tomography