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M: Metallphysik
M 12: Flüssige und amorphe Metalle III
M 12.1: Talk
Friday, March 4, 2005, 14:45–15:00, TU H111
Diffusion in AlNiCe melts near the liquidus temperature — •Axel Griesche1, Michael-Peter Macht1, Rainer Schmid-Fetzer2, and Günter Frohberg3 — 1Hahn-Meitner-Institute Berlin, Glienicker Str. 100, D-14109 Berlin — 2Institute of Metallurgy, Technical University Clausthal, Robert-Koch-Straße 42, D-38678 Clausthal-Zellerfeld — 3Institute of Material Sciences and Technology, Technical University Berlin, Hardenbergstr. 36, D-10623 Berlin
Interdiffusion and self diffusion in Al87Ni10Ce3 and Al77Ni20Ce3 melts were measured at 1273 K and 1373 K, respectively, using the long-capillary method. The chemical diffusion profiles were determined by means of energy dispersive x-ray spectroscopy (EDX). For self diffusion, the penetration profiles of stable 62Ni and stable 142Ce isotopes were measured by means of inductive-coupled plasma mass spectroscopy (ICP-MS). The thermodynamic factor was calculated from chemical potential data that were obtained by extrapolating the Gibbs free energy of the binary systems into the ternary melt using a Redlich-Kister model. The correlation between the interdiffusion coefficients, the self diffusion coefficients and the thermodynamic factor was studied by use of the Darken-Manning relation. The enhancement of chemical diffusion with respect to self diffusion correlates linearly with the thermodynamic factor.