Dresden 2026 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 23: Topical Session: Dislocations in Functional Materials I (joint session MM/FM)
MM 23.3: Vortrag
Mittwoch, 11. März 2026, 10:45–11:00, SCH/A251
Dislocation interaction with a tilt low angle grain boundary in bi-crystal SrTiO3 — •Kuan Ding1,2, Atsutomo Nakamura3, Patrick Cordier4,5, and Xufei Fang3,6 — 1Department of Materials and Earth Sciences, Technical University of Darmstadt, 64287 Darmstadt, Germany — 2Max Planck Institute for Sustainable Materials, Max-Planck-Straße 1, 40237 Düsseldorf, Germany — 3Department of Mechanical Science and Bioengineering, Osaka University, 1-3 Machikaneyama-chou, Toyonaka, Osaka, 560-8531, Japan — 4Unité Matériaux et Transformations, Université de Lille, 59655 Villeneuve d'Ascq Cedex, France — 5Institut universitaire de France (IUF), 75005 Paris, France — 6Institute for Applied Materials, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131 Karlsruhe, Germany
For applications of ceramics with dislocation-tuned mechanical and functional properties, it is pertinent to achieve dislocation engineering in polycrystalline ceramics. However, grain boundaries (GBs) are effective barriers for dislocation glide at room temperature. It is critical to understand the fundamental processes for dislocation-GB interaction. We investigated a bi-crystal SrTiO3 with a 4° tilt GB. Brinell indentation was used to generate a plastic zone at the mesoscale without cracking, allowing for direct assessment of GB-dislocation interaction. Together with dislocation etch pits imaging and transmission electron microscopy analysis, we observe dislocation pileup, storage, and transmission across the LAGB. Our observations reveal new insights into dislocation-GB interaction at room temperature at mesoscale.
Keywords: dislocation; low angle tilt grain boundary; slip transmission; SrTiO3; TEM