Dresden 2014 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 34: Poster Session
MM 34.10: Poster
Tuesday, April 1, 2014, 18:00–20:00, P4
Showdown! Comparing phase field simulations to time-resolved x-ray tomography measurements of Ostwald ripening in 3D — Thomas Werz1, Nan Wang2, Michael Heinze3, Stefan Odenbach3, Long-Qing Chen2, and •Carl Krill1 — 1Inst. of Micro and Nanomaterials, Ulm University, Germany — 2Dept. of Materials Science and Engineering, The Pennsylvania State University, USA — 3Inst. of Fluid Mechanics, TU Dresden, Germany
It's not only moviegoers whose imagination has been captured by the 3D revolution in imaging technology---even materials scientists have been swept up in the hype. Their excitement is understandable, given the power of techniques like x-ray microtomography to map out microstructural evolution with high spatial and temporal resolution. However, not everyone believes that the resulting 3D ``movies'' are worthy of Oscar consideration: after all, computational materials scientists have generated thousands of 3D simulations without winning a single Academy Award! Perhaps voters are still waiting for the computational algorithms to be validated against experiment. We have addressed the latter issue by investigating Ostwald ripening in the model system Al-5 wt% Cu, using x-ray microtomography to obtain real-time 3D image sequences of particle growth and shrinkage. We then employed a phase-field model to simulate coarsening in the same sample region, starting from the measured initial configuration. The stage is now set for a showdown in 4D (3 spatial dimensions + time) between experiment and computer simulation. The results could decide once and for all whether theorists can lay claim to simulating reality!