Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 9: SYM Phase Transformations in Metallic Melts III
MM 9.1: Hauptvortrag
Montag, 25. Februar 2008, 14:45–15:15, H 1058
Atomic Diffusion in Liquid Alloys — •Andreas Meyer1,2, Suresh Mavila Chathoth2, Winfried Petry2,3, Tobias Unruh3, and Marek Koza4 — 1Institut für Materialphysik im Weltraum, DLR Köln — 2Physik Department E13, TU München — 3FRM-II, TU München — 4Institut Laue Langevin, Grenoble
We investigate the atomic motion in liquids on Ni-, Pd-, and Zr- basis in order to clarify the microscopic transport mechanisms. High-resolution energy and momentum information from neutron scattering experiments allows to study how the atomic dynamics depends on structural properties, and in some special cases to derive the self diffusion coefficient of one particular component on an absolute scale. Results on binary alloys and multicomponent bulk glass forming melts, reveal non-trivial mechanisms of mass transport. We show that the relation between equilibrium melt structure and atomic transport is well described by a mode-coupling theory. Our findings are discussed in the context of results obtained by molecular dynamics simulations and long capillary diffusion experiments performed by other groups within the SPP 1120.