Berlin 2018 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 35: Interfaces

MM 35.5: Talk

Wednesday, March 14, 2018, 12:45–13:00, H 0107

Mesoscopic simulations of grain boundary motion: influences on the Zener drag — •Volker Mohles — Interdisciplinary Centre for Advanced Materials Simulation ICAMS, Ruhr-Universität Bochum, Bochum, Germany

A new three-dimensional vertex model of grain boundary motion has been developed in which, for now, a single grain boundary is pushed through an array of particles in order to derive the Zener drag, i.e. the effective pinning force of these particles on grain boundaries. The spherical particles have a realistic size distribution and spatial arrangement. Like the grain boundary itself, the particle interfaces are described by a network of triangular facets, with the distinction that the nodes connecting the particle facets can only move tangentially along the surface of the prescribed particle shape. The model also accounts for the energy of the triple lines connecting the particles with the grain boundary. The simulations allow to derive the Zener drag as a function of the grain boundary energy, for now assumed to be independent of the grain boundary inclination, the triple line energy (constant), the mean particle size, and their volume fraction. The effects of varying size distribution and spatial arrangement are also tested. The results are compared to established formulations for the Zener drag.