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.

scholarly journals Diffusion coefficients in multiphase Ni80Cr20-Ti system

2021 ◽  
Vol 57 (1) ◽  
pp. 137-144
Author(s):  
B. Wierzba ◽  
D. Serafin ◽  
W.J. Nowak ◽  
P. Wierzba ◽  
A. Ciecko ◽  
...  
Keyword(s):  
Ternary System ◽  
Diffusion Couple ◽  
Diffusion Coefficients ◽  
Effective Diffusion ◽  
Intermetallic Phases ◽  
Reactive Diffusion ◽  
Intrinsic Diffusion ◽  
Two Phase ◽  
Effective Diffusion Coefficients

In this paper, the reactive diffusion in Ni80C20r?Ti ternary system is discussed at 1173K. The diffusion couple was prepared and annealed for 100 h. The two intermetallic phases and two two-phase zones occurred, namely: Ti2Ni, TiNi, TiNi+Cr, and TiNi3+Cr. Based on the experimental results (molar fractions, thicknesses of the intermetallic phases), the intrinsic diffusion coefficients of all components in each phase were numerically approximated. The Wagner method was used in the pure intermetallic phases. In the two phase zones the approximation was based on the generalized Darken and Wagner methods. The presented methods allowed for determination of the effective diffusion coefficients in each presented phase.

Effect of high magnetic field on intermetallic phase growth in Ni–Al diffusion couples

2009 ◽  
Vol 472 (1-2) ◽  
pp. 525-529 ◽  
Author(s):  
Xiao Ren ◽  
Guo-Qing Chen ◽  
Wen-Long Zhou ◽  
Cheng-Wei Wu ◽  
Jun-Shan Zhang
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Intermetallic Phase ◽  
Diffusion Couples ◽  
Phase Growth

Selected Analyses and Observations in Multicomponent Diffusion

2010 ◽  
Vol 297-301 ◽  
pp. 1451-1460 ◽  
Author(s):  
Mysore A. Dayananda
Keyword(s):  
Multicomponent Diffusion ◽  
Diffusion Couples ◽  
Uphill Diffusion ◽  
Diffusion Studies ◽  
Isothermal Diffusion ◽  
Mn Diffusion ◽  
Experimental Approaches ◽  
Diffusion Paths ◽  
Interdiffusion Coefficients

Selected isothermal diffusion studies in ternary and quaternary systems are reviewed in order to present analytical and experimental approaches adopted for the determination of interdiffusion fluxes of components, interdiffusion coefficients, diffusional interactions among components, and internal consistency in the experimental data. Several interesting phenomena and observations including uphill diffusion, zero-flux planes and flux reversals, and double serpentine diffusion paths are illustrated with selected single phase Cu-Ni-Zn, Fe-Ni-Al and Cu-Ni-Zn-Mn diffusion couples. The main challenges involved in the experimental determination of interdiffusion data from multicomponent diffusion couples and in the application of such data are also addressed.

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.

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