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M: Metallphysik

M 15: Symposium: Phasenumwandlungen in Schmelzen V

M 15.2: Vortrag

Dienstag, 25. März 2003, 10:30–10:45, IFW A

Diffusion in Multicomponent Liquid Pd-Based Melts Near the Liquidus Temperature — •Axel Griesche¹, Michael-Peter Macht¹, Shinsuke Suzuki², and Günter Frohberg² — ¹Hahn-Meitner-Institute Berlin, Glienicker Str. 100, D-14109 Berlin — ²Institute of Materials Sciences and Technologies, Technical University Berlin, Hardenbergstr. 36, D-10623 Berlin

Interdiffusion between Pd₄₀Cu₃₀Ni₁₀P₂₀ and Pd₄₀Ni₄₀P₂₀ melts and self diffusion of Ni⁶² in molten Pd₄₀Cu₃₀Ni₁₀P₂₀ were measured in the temperature range from 873 K to 1373 K using the long-capillary method. The diffusion profiles were determined by means of EDX and ICP-MS. The self diffusion coefficients compare well with such ones, derived from quasi-elastic neutron scattering measurements and with diffusion coefficients calculated from viscosity data using the Stokes-Einstein relation. The correlation between the coefficients of inter- and self diffusion and the thermodynamic factor, which was calculated from literature data, was studied by use of the Darken-Manning relation.