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MM: Fachverband Metall- und Materialphysik

MM 26: Interface Controlled Properties and Nanomaterials: Grain Boundaries and Stability, Spectroscopy and Interatomic Potentials

MM 26.4: Vortrag

Mittwoch, 29. März 2023, 11:00–11:15, SCH A 216

Disconnection-mediated migration of interfaces: continuum modeling and applications — •Marco Salvalaglio¹, Caihao Qui², 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, China — ³Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China

We present a model for the motion of arbitrarily curved interfaces that respects the underlying crystallography of two phases/domains meeting at an interface and is consistent with microscopic mechanisms of interface motion, i.e., migration of disconnection (line defects in the interface with step and dislocation character) [1]. The equation of motion for interface migration under the influence of a wide range of driving forces is discussed with the aid of numerical simulations [1,2]. A diffuse interface framework is also used to handle complex morphology and deliver proof of concept for microstructure evolution [2]. Recent results achieved with this model, concerning grain boundary morphologies, the competition among thermodynamic and kinetic effects, and grain rotation will be illustrated. [1] J. Han et al. Acta Materialia 227, 117178, (2022). [2] M. Salvalaglio et al. Acta Materialia 227, 117463, (2022).