Regensburg 2010 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 41: Topical Session Growth Kinetics II
MM 41.4: Vortrag
Mittwoch, 24. März 2010, 18:00–18:15, H4
Local grain growth kinetics in Al-Mg studied by 3DXRD microscopy — •Carl E. Krill III1, Søren Schmidt2, and Carsten Gundlach3 — 1Institute of Micro and Nanomaterials, Ulm University, Ulm, Germany — 2Risø DTU, Roskilde, Denmark — 3MAX-lab, Lund University, Lund, Sweden
With the recent extension of the Mullins-von Neumann relation to 3D by MacPherson and Srolovitz comes new impetus for measuring the local kinetics of grain growth in real polycrystalline specimens. Thanks to three-dimensional x-ray diffraction microscopy (3DXRD), it is now possible to map the 3D microstructure of a single-phase polycrystalline material nondestructively, which opens up an exciting new avenue for the in situ study of grain growth. In this contribution, we report the microstructural characterization of hundreds of contiguous grains in a polycrystalline specimen of Al-1wt.% Mg before and after an anneal at 350∘C. By measuring the displacement of individual grain boundaries, we are able to assess the local kinetics of growth (and shrinkage) for a statistically significant number of grains—information that can then be compared to the predictions of analytic models for the evolution of local and statistically averaged microstructural parameters. Exploiting the volumetric nature of the grain-boundary mapping that is delivered by 3DXRD, we conduct a direct experimental test of the extent to which the Al-Mg sample microstructure evolves as predicted by a phase-field model for grain growth under the assumption of isotropic boundary mobilities and energies.