Atomic diffusion and its relation to thermodynamic forces in Al-Ni melts

被引：17

作者：

Griesche, Axel ^{[1
]}

Zhang, Bo ^{[1
]}

Horbach, Juergen ^{[1
]}

Meyer, Andreas ^{[1
]}

机构：

[1] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Mat Phys Weltraum, D-51170 Cologne, Germany

来源：

DIFFUSION IN MATERIALS - DIMAT2008 | 2009年 / 289-292卷

关键词：

Interdiffusion; Self Diffusion; X-ray Radiography; Al-Alloys; Darken Equation; VISCOSITY;

D O I：

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

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：705 / 710

页数：6

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