Paper Title:
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.

  Info
Periodical
Defect and Diffusion Forum (Volumes 289-292)
Edited by
A. Agüero, J.M. Albella, M.P. Hierro, J. Phillibert and F.J. Pérez Trujillo
Pages
705-710
DOI
10.4028/www.scientific.net/DDF.289-292.705
Citation
A. Griesche, B. Zhang, J. Horbach, A. Meyer, "Atomic Diffusion and its Relation to Thermodynamic Forces in Al-Ni Melts", Defect and Diffusion Forum, Vols. 289-292, pp. 705-710, 2009
Online since
April 2009
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