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M: Metallphysik

M 12: Flüssige und amorphe Metalle III

M 12.1: Vortrag

Freitag, 4. März 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.