Paper Title:
Diffusion in Metallic Melts
  Abstract

We present diffusion measurements in metallic melts measured by capillary techniques and results of molecular dynamic simulations. The investigated systems are the binary alloy AlNi20 and the multicomponent bulk glass-forming alloy Pd43Cu27Ni10P20. The temperature range of interest reached from the glassy state to the equilibrium melt. In the glassy as well as in the deeply supercooled state, below the critical temperature Tc of the mode-coupling, theory (MCT), diffusion is a highly collective atomic hopping process. Both investigated systems show around Tc a change in the diffusion mechanism. Above the liquidus temperature, diffusion in Pd43Cu27Ni10P20 is a collective process whereas in AlNi20 the atoms diffuse probably by uncorrelated binary collisions. The influence of thermodynamic forces on diffusion in the liquid state of AlNi20 can be described by the Darken equation with an additional temperature independent correction factor (“Manning”- factor).

  Info
Periodical
Edited by
Y.H. Sohn, C. Campbell, D. Lewis and A. Lupulescu
Pages
101-108
DOI
10.4028/www.scientific.net/DDF.266.101
Citation
A. Griesche, M.P. Macht, G. Frohberg, "Diffusion in Metallic Melts", Defect and Diffusion Forum, Vol. 266, pp. 101-108, 2007
Online since
September 2007
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$32.00
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