Determination of the intrinsic diffusivities from the diffusion couple experiment in multicomponent systems

2017 ◽  
Vol 138 ◽  
pp. 48-51 ◽  
Author(s):  
Marek Zajusz ◽  
Juliusz Dąbrowa ◽  
Marek Danielewski
Keyword(s):  
Diffusion Couple ◽  
Multicomponent Systems ◽  
Diffusion Couple Experiment ◽  
Couple Experiment

Anisotropic Diffusion Behaviour of Al and Zn in HCP Mg: Diffusion Couple Experiment Using Mg Single Crystal

2013 ◽  
Vol 765 ◽  
pp. 516-520 ◽  
Author(s):  
Sazol Kumar Das ◽  
Young Min Kim ◽  
Tae Kwon Ha ◽  
Raynald Gauvin ◽  
In Ho Jung
Keyword(s):  
Diffusion Couple ◽  
Single Crystal ◽  
Diffusion Coefficients ◽  
Basal Plane ◽  
Anisotropic Diffusion ◽  
Self Diffusion ◽  
Multiphase Diffusion ◽  
Diffusion Couple Experiment ◽  
Couple Experiment ◽  
Diffusion Behaviour

Diffusion couple experiments for Mg-Al and Mg-Zn were carried out with Mg single crystal to determine the anisotropic diffusion coefficients of Al and Zn in hcp Mg at the temperature range between 553 and 693 K. Based on the experimental results, anisotropic diffusion coefficients of Al and Zn were calculated using multiphase diffusion simulations. Al diffusion in hcp Mg is slightly faster than Mg self-diffusion itself, but the diffusion of Zn is slightly slower than Mg self-diffusion. The diffusion coefficients of Al and Zn along the a-axis (basal plane) of hcp Mg is slightly higher (1.1-1.4 times) than those along the c-axis (normal to the basal plane), which is also similar to Mg self-diffusion behaviour.

Determination of vapor—liquid equilibrium diagrams of multicomponent systems

2016 ◽  
Vol 70 (12) ◽  
Author(s):  
Leonid Serafimov ◽  
Anastasia Frolkova
Keyword(s):  
Phase Diagram ◽  
Multicomponent Systems ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
Equilibrium Modeling ◽  
Component Systems ◽  
Full Structure ◽  
Concentration Simplex ◽  
Vapor Liquid

AbstractA method for the determination of vapor–liquid phase diagram structure of five-component systems based on the analysis of types and Poincare indexes of singular points of the geometric scan and full structure of the concentration simplex is proposed. Validity of the proposed method was demonstrated by vapor–liquid equilibrium modeling in five-component mixtures: ethanol + water + toluene + butanol + chlorbenzene and acetone + chloroform + ethanol + cyclohexane + water.

Ein neues Verfahren zur Berechnung der Diffusionskoeffizienten in Multikomponentensystemen aus Meßdaten der quasistationären Diffusion / A new procedure for the determination of diffusion coefficients from quasi-stationary diffusion measurements in multicomponent systems

1975 ◽  
Vol 30 (4) ◽  
pp. 561-566
Author(s):  
W. Meiske ◽  
W. Schmidt ◽  
E. Kahrig
Keyword(s):  
Differential Equations ◽  
Diffusion Coefficients ◽  
Multicomponent Systems ◽  
Equivalent System ◽  
System Of Integral Equations ◽  
Component System ◽  
Flow Equations ◽  
Stationary Diffusion ◽  
Numerical Performance

Abstract Diffusion in an (n+1) -component system is described by Onsager's flow equations the integration of which leads in the case of quasi-stationarity to the differential equations d(Δc)/dt=-βD̅Δ c (Δc: vector of concentration differences between the compartments of the cell, D̅: matrix of integral diffusion coefficients, β: apparatus constant). Several procedures are known to determine these diffusion coefficients from such equations but all of them have certain disadvantages. In this paper a new method is described to compute the integral diffusion coefficients, which starts from the associated equivalent system of integral equations. The mathematical formalism is simple, and its numerical performance does not become more difficult with an increasing number of components of the system.

Determination of interdiffusion coefficients of Si and Al in Ti 3 SiC 2 –Ti 3 AlC 2 diffusion couple at 1373‐1673 K

2019 ◽  
Vol 103 (1) ◽  
pp. 670-680
Author(s):  
Zerong Zhang ◽  
Xiaohui Yin ◽  
Yuhai Qian ◽  
Jingjun Xu ◽  
Jun Zuo ◽  
...  
Keyword(s):  
Diffusion Couple ◽  
Interdiffusion Coefficients

Numerical Determination of Intrinsic Diffusion in Fe-Cr-Al Systems

2010 ◽  
Vol 297-301 ◽  
pp. 948-953
Author(s):  
Bartłomiej Wierzba ◽  
Olivier Politano ◽  
Sébastien Chevalier ◽  
Marek Danielewski
Keyword(s):  
Concentration Profile ◽  
Diffusion Coefficients ◽  
Numerical Results ◽  
Multicomponent Systems ◽  
Numerical Determination ◽  
Intrinsic Diffusion ◽  
Aluminide Coatings ◽  
Interdiffusion Process

The intrinsic diffusion coefficients in diffusion aluminide coatings based on Fe-30Cr were determined at 1000oC. The diffusion fluxes were given by the Nernst Planck formulae and the Darken method for multicomponent systems was applied. This paper summarizes some numerical results to determine the composition dependent diffusivities in Fe-Cr-Al systems. The method presented in this study to obtain average intrinsic diffusion coefficients is as an alternative to the Dayananda method. Our method based on empirical parameters allowed us to predict the concentration profile during the interdiffusion process.

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