6.4 Determination of ternary intrinsic diffusion coefficients with inert markers

2005 ◽  
pp. 377-378
Author(s):  
M. A. Dayananda
Keyword(s):  
Diffusion Coefficients ◽  
Intrinsic Diffusion ◽  
Inert Markers

The Sequence of the Phase Growth during Diffusion in Ti-Based Systems

2019 ◽  
Vol 38 (2019) ◽  
pp. 151-157 ◽  
Author(s):  
Bartek Wierzba ◽  
Wojciech J. Nowak ◽  
Daria Serafin
Keyword(s):  
Theoretical Analysis ◽  
Entropy Production ◽  
Diffusion Coefficients ◽  
Intermetallic Phase ◽  
Intermetallic Phases ◽  
Diffusion Couples ◽  
Intrinsic Diffusion ◽  
Phase Growth ◽  
Diffusion Paths

AbstractThe interdiffusion in Ti-based alloys was studied. It was shown that during diffusion at 1,123 K formation of four intermetallic phases occurs. The diffusion paths for six different diffusion couples were determined. Moreover, the entropy production was calculated – the approximation used for determination of the sequence of intermetallic phase formation. In theoretical analysis, the intrinsic diffusion coefficients were determined from the modified Wagner method.

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.

Bestimmung partieller Diffusionskoeffizienten binären Legierungen vom Substitutionstyp mit Hilfe dünner Scheibenpaare / Determination of the Intrinsic Diffusion-coefficients of Binary Solid Solution Alloys with the Aid of Thin Plates

1977 ◽  
Vol 32 (1) ◽  
pp. 54-56 ◽  
Author(s):  
Th. Heumann
Keyword(s):  
Solid Solution ◽  
Solid Solutions ◽  
Diffusion Coefficients ◽  
New Method ◽  
Thin Plates ◽  
Intrinsic Diffusion ◽  
Binary Solid Solution

Abstract Determination of the Intrinsic Diffusion-coefficients of Binary Solid Solution Alloys with the Aid of Thin Plates A new method for determining intrinsic diffusion-coefficients in binary solid solutions of the substitutional typ is described. For this, thin plates are used having such a thickness that during annealing the specimen becomes nearly homogenious. From the shift of the original interface one obtaines the ratio of the intrinsic diffusion-coefficients for the concentration in the Kirkendall interface.

Numerical Determination of Intrinsic Diffusion Coefficient of Aluminide Coatings on Metals

2009 ◽  
Vol 289-292 ◽  
pp. 269-276 ◽  
Author(s):  
Bartłomiej Wierzba ◽  
Sébastien Chevalier ◽  
Olivier Politano ◽  
Marek Danielewski
Keyword(s):  
Diffusion Coefficient ◽  
Concentration Profile ◽  
Diffusion Coefficients ◽  
Reactive Diffusion ◽  
Intrinsic Diffusion Coefficient ◽  
Numerical Determination ◽  
Intrinsic Diffusion ◽  
Aluminide Coatings ◽  
Interdiffusion Process

This paper presents a numerical method to determine the composition dependent diffusivities and to predict the concentration profile during the interdiffusion process. The intrinsic diffusion coefficients in diffusion aluminide coatings (Fe-Al) were determined at 1000oC. The obtained diffusion coefficient for iron in Fe3Al or FeAl is in the range 10-10 to 10-9 cm2.s-1. The aluminum diffusion coefficient varies from 10-11 to 10-7 cm2.s-1 in the same phases.The present approach also permits to model the reactive diffusion in the Fe-Al systems.

Verbesserung des Meß-und Auswerteverfahrens zur Bestimmung der gemeinsamen und partiellen Diffusionskoeffizienten am Beispiel von Kupfer-Gold-Legierungen/An Improved Method for Measuring and Analysing Chemical and Intrinsic Diffusion Coefficients Applied to Copper-Gold Alloys

1975 ◽  
Vol 30 (10) ◽  
pp. 1282-1289 ◽  
Author(s):  
Th. Heumann ◽  
Th. Rottwinkel
Keyword(s):  
Electron Microprobe ◽  
Diffusion Coefficients ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Total Concentration ◽  
Chemical Diffusion ◽  
Diffusion Profile ◽  
Intrinsic Diffusion ◽  
Mean Values

Abstract A method is described which enables the determination of the chemical diffusion coefficients D̃ in a binary system as well as the intrinsic diffusion coefficients of both components with sufficient accuracy. The difference in concentration between the diffusion couples should not exceed 5 at%. Numerous diffusion profiles at different annealing times are taken by electron microprobe analysis from each specimen before calculating D̃ according to a method proposed by Sauer and Freise Combining the results for different pairs of specimens with overlapping concentration range mean values of D̃ are obtained in the total concentration range unter consideration. An analytical expression for D̃ is given, which is used to determine the diffusion profile for a special diffusion couple according to the method of Wagner4 . By this one obtains the total diffusion profile including the flat ends which cannot be accurately determinated by electron microprobe analysis. The determination of the intrinsic diffusion coefficients according to van Loo5 is based on these calculated profiles with additional knowledge of the position of the welding interface. This method has been applied to diffusion measurements in Cu-Au alloys. The following relation for D̃ has been found in the concentration range between 0 and 32 at% Au at 911 °C D̃(N)Cu Au911 °C =3,71·10-10 + 5.04·10-9 N+1.76·10-10 N2 + 1.01 -10-11 N3 [cm2 sec-1 ]. N = mole fraction of Au.

scholarly journals Interdiffusion in NiAl,CoAl,FeAl compounds and determination of intrinsic diffusion coefficients by multiple markers method.

Materia Japan ◽  
2000 ◽  
Vol 39 (6) ◽  
pp. 497-501 ◽  
Author(s):  
Yoshihiro Yamazaki ◽  
Ryusuke Nakamura ◽  
Koichi Takasawa ◽  
Yoshiaki Iijima
Keyword(s):  
Diffusion Coefficients ◽  
Intrinsic Diffusion ◽  
Multiple Markers

scholarly journals On Determination of Inter and Intrinsic Diffusion Coefficients in Binary System

1984 ◽  
Vol 25 (1) ◽  
pp. 11-18 ◽  
Author(s):  
Masami Onishi ◽  
Yoshinori Wakamatsu ◽  
Toshitada Shimozaki
Keyword(s):  
Binary System ◽  
Diffusion Coefficients ◽  
Intrinsic Diffusion
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