Berlin 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 29: Poster II
MM 29.31: Poster
Dienstag, 19. März 2024, 17:00–19:00, Poster B
A tale of two alloys: Extreme abnormal grain growth in AA5052 and AA5252 — •Karolína Gutbrod1, Helmuth-André Schulz-Harder1, Jules M. Dake1, Madlen Atzen1, Baptiste Flipon2, Marc Bernacki2, Timo Weihberger3, and Carl E. Krill III1 — 1Institute of Functional Nanosystems, Ulm University, Germany — 2MINES ParisTech, PSL University, France — 3Speira GmbH, Hamburg, Germany
Grain growth is a phenomenon that occurs in polycrystalline materials during heat treatment. At a sufficiently high temperature, atoms located at grain boundaries can gain enough energy to hop from one grain to another, effecting a rearrangement of the microstructure. The grains that acquire additional atoms increase in size, while their counterparts shrink and eventually disappear, causing the average grain size to increase with time. If the grain size distribution maintains a unimodal shape during this process, we speak of normal grain growth (NGG). During another type of microstructural evolution -- abnormal grain growth (AGG) -- a few grains consume their neighbors, which enormously increases their size and cause a second maximum to appear in the grain size distribution. In most cases, the mechanisms responsible for AGG are still the subject of active debate. By investigating the occurrence of AGG in the Al-alloys AA5052 and AA5252, which differ only in their Cr content, we have attempted to contribute new findings to this discussion. Electron backscatter diffraction (EBSD) measurements -- confirmed, in part, by diffraction contrast tomography (DCT) -- point to similarities and differences in the conditions for AGG.
Keywords: Abnormal grain growth; Microstructural evolution; Al-alloy; EBSD