Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 44: Materials Design II

MM 44.4: Vortrag

Mittwoch, 24. März 2010, 17:00–17:15, H5

Large grain systems based on experimental EBSD-data and influence of elastic forces — •Michael Selzer, Marcus Jainta, Mathias Reichardt, Andreas Unser, and Britta Nestler — Institute for Materials and Processes, Karlsruhe, Germany

Phase-field simulations are applied to investigate the evolution of large polycrystalline grain structures from the melt or using EBSD data from experiments as initial condition. We study the dependence of grain boundary anisotropy on the evolution of the grain size distributions and the effect of misorientation distributions on the growth laws in 2D and 3D. Additionally it is possible to predict the failure and strength properties of the investigated metallic alloys. To achieve this it is necessary to take in account the influence of elastic forces. When applying a sufficient amount of stress, the grain structure breaks and forms a crack. In numerical simulations, we investigate crack propagation in polycrystalline metallic alloys for mode I and III. The shape of such cracks depends on the applied loads and on the grain distribution of the observed material. Suitable simulations require many grains in a relatively large domain. For this goal, we present a parallel, optimized multi phase field model featuring efficient modeling of large three dimensional phase systems coupled with a model for elastic stresses. We show results for 2D and 3D crack developments along grain boundaries and in polycrystalline systems based on experimental EBSD data.