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MM: Fachverband Metall- und Materialphysik
MM 30: Interface Controlled Properties, Nanomaterials, and Microstructure Design II
MM 30.1: Vortrag
Donnerstag, 12. März 2026, 10:15–10:30, SCH/A215
Statistics of Shear-Coupled Grain Growth in Polycrystals — •Marco Salvalaglio1, Caihao Qiu2, Jian Han2, and David J. Srolovitz3 — 1Institute of Scientific Computing, TU Dresden, 01062 Dresden, Germany — 2Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR — 3Department of Mechanical Engineering, The University of Hong Kong, Pokfulam, Hong Kong SAR
Grain growth in polycrystals, the coarsening of crystalline domains with different orientations, is traditionally viewed as a capillarity-driven process governed by interfacial energy minimization. However, grain-boundary migration can also induce, and in turn couple to, shear deformation, making microstructure evolution sensitive to externally applied stress. At the microscopic level, this behavior arises from the motion of disconnections, steps with dislocation character constrained at grain boundaries. Using a multi-phase-field (PF) framework that incorporates disconnection flow through coarse-graining, we demonstrate that accounting for shear coupling enables realistic grain-growth behavior in single-component polycrystals. Simulations reproduce recent experimental observations of weak correlations between grain boundary velocity and curvature. We then use PF simulations to analyze key aspects of microstructure evolution, including grain-size distributions, grain-shape evolution, and statistical characterization of the evolving network.
Keywords: Polycrystals; Grain Growth; Shear Coupling; Disconnections; Microstructure Evolution