Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 34: Poster Session
MM 34.4: Poster
Dienstag, 1. April 2014, 18:00–20:00, P4
Spatial and orientational tracking of Ostwald ripening in semisolid Al-Cu by 3DXRD microscopy — •James C. Shatto1, Jules Dake1, Thomas Werz1, Jette Oddershede2, Henning Sørensen3, Søren Schmidt2, and Carl Krill1 — 1Inst. of Micro and Nanomaterials, Ulm University, Germany — 2Dept. of Physics, Technical University of Denmark — 3Dept. of Chemistry, University of Copenhagen, Denmark
Coarsening, a phenomenon that occurs whenever a polycrystalline material is subjected to thermal processing, has long been a favorite topic of materials scientists. Examples include grain growth (in single-phase samples) and Ostwald ripening (in multiphase materials). Using the relatively new technique of Three-Dimensional X-Ray Diffraction (3DXRD) microscopy, we have investigated the coarsening-induced growth/shrinkage of solid, Al-rich particles embedded in a liquid matrix (of higher Cu content). The measurement technique reveals not only the spatial extent of each crystalline particle but also its lattice orientation at discrete time steps. From this information we can study the migration rates of individual particle boundaries as a function of relative lattice misorientation across the boundary. Such data may yield the first experimental differentiation between the conventional mechanism for Ostwald ripening (atomic diffusion through the second phase) and particle growth via coalescence or diffusion of atoms across single-phase interfaces.