Paper Titles
A Molecular Dynamics Study of Self-Diffusion in the Core of a Screw Dislocation in Al
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A Mathematical Formulation for Interfacial Diffusion, Incorporating Deviation from the Classical Random Walk Theory
p.63
First-Principles Computation of Transition-Metal Diffusion Mobility
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An Examination of Diffusion Paths in Terms of Interdiffusion Fluxes and Interdiffusion Coefficients
p.83
Diffusion in Metallic Melts
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Diffusion in Bulk Glass Forming Alloys– from the Glass to the Equilibrium Melt
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Non-Random Interaction of Vacancies with Atoms during Interdiffusion and Ionic Conductivity in Materials
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Interdiffusion Behavior in γ-Phase U-Mo Alloy versus Al-6061 Alloy Couples Fabricated by Friction Stir Welding
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Growth Kinetics of Intermetallic Phases in U-Mo vs. Al Alloy Diffusion Couples Annealed at 550°C
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Diffusion in Metallic Melts

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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).

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Periodical:

Defect and Diffusion Forum (Volume 266)

Pages:

101-108

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.266.101

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Online since:

September 2007

Authors:

Axel Griesche, M.P. Macht, Günter Frohberg

Keywords:

Darken, Diffusion, Diffusion Mechanism, Manning, Melt, Thermodynamic Factor

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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