Dresden 2020 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 30: Poster Session II

MM 30.8: Poster

Tuesday, March 17, 2020, 18:15–20:00, P4

Abnormal grain growth in Al(Cu) assisted by Zener pinning — •Maria Hohm, Raphael Zeller, Mingyan Wang, and Carl E. Krill III — Institute of Functional Nanosystems, Ulm University, Germany

Abnormal grain growth occurs during the heat treatment of polycrystals when a subpopulation of crystallites undergoes rapid growth at the expense of neighboring grains, leading to a bimodal grain size distribution. In some cases, abnormal grain growth appears to be triggered by grain boundaries interacting with second-phase particles, a process called Zener pinning. Although of considerable technological importance, there is still no consensus regarding the mechanism(s) underlying abnormal grain growth assisted by Zener pinning; indeed, most experimental studies of the phenomenon have been carried out on sample sections or thin films, for which the free surface is a complicating factor. The latter limitation can be circumvented by 3D characterization techniques like diffraction-based x-ray microscopy, which are able to assess the size and morphology of grains, the lattice misorientation at grain boundaries and the distribution of pinning particles throughout a bulk specimen. From such data, we aim to identify how pinning particles initiate and govern abnormal grain growth in Al(Cu) alloys.