Atomic Diffusion and its Relation to Thermodynamic Forces in Al-Ni Melts

Axel Griesche; Bo Zhang; Jürgen Horbach; Andreas Meyer

doi:10.4028/www.scientific.net/DDF.289-292.705

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Impact of Carbon on the Diffusion of Donor Atoms in Germanium
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Diffusion in Isotope Heterostructures Investigated by Neutron Reflectometry
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Atomic Diffusion and its Relation to Thermodynamic Forces in Al-Ni Melts
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Solute Diffusion in Grain Boundaries – Outside the Scope of Fisher Model
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Concentration Characteristics of Diffusion-Induced Recrystallization
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Jump Frequencies of Cd Tracer Atoms in L1₂ Lanthanide Gallides
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Computer Simulation of Diffusion in Dilute Al-Fe Alloys
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Atomic Diffusion and its Relation to Thermodynamic Forces in Al-Ni Melts

Abstract:

We make use of a novel X-ray radiography method to measure chemical diffusion in capillaries in binary Al-Ni melts. Data are compared to self diffusion coefficients of Ni obtained by quasielastic neutron scattering as well as diffusion and thermodynamic data obtained by molecular dynamic simulations. Interdiffusion compared to self diffusion is enhanced with a maximum at Al40Ni60. We show that this enhancement is caused by thermodynamic forces as described by the Darken-Manning equation. In liquid Al-Ni alloys the Manning factor that is smaller than one can be attributed to collective cross correlations.