NickelMaghrebV1, Main, Exploration, bibRecord, 000E18

Prediction of solute concentration profiles for discontinuous dissolution

Identifieur interne : 000E18 ( Main/Exploration ); précédent : 000E17; suivant : 000E19

Prediction of solute concentration profiles for discontinuous dissolution

Auteurs : P. Zieba [Pologne] ; D. Bradai [Algérie] ; W. Gust [Allemagne]

Source :

Zeitschrift für Metallkunde [ 0044-3093 ] ; 1997.

RBID : Pascal:97-0365793

Descripteurs français

Pascal (Inist)
- Dissolution, Diffusion(transport), Transformation phase, Modélisation, Soluté, Solubilité, Alliage base nickel, Indium alliage, Alliage binaire, Etude théorique, Alliage Ni97In3, In Ni, 6475.

English descriptors

KwdEn :
- Binary alloys, Diffusion, Dissolution, Indium alloys, Modeling, Nickel base alloys, Phase transformations, Solubility, Solutes, Theoretical study.

Abstract

The applicability of the Tu-Turnbull and Zieba-Pawlowski diffusion models of discontinuous dissolution have been considered. The simulation procedure applied to the Ni-1.4 at.%. In alloy has shown a much better applicability of the Zieba-Pawlowski model than the Tu-Turnbull model for the prediction of the In concentration profiles left behind the receding reaction front. This comes from the fact that in the Tu-Turnbull model the same ratio between migration velocity and grain boundary diffusivity is assumed for both discontinuous precipitation and dissolution processes. This is only true when the difference between temperatures of discontinuous precipitation and subsequent discontinuous dissolution is relatively small. It has also been shown that the results of simulation become better with an increase of the residual supersaturation of the depleted α lamellae as well as with an increase of the characteristic solute concentration left at the places where the β lamellae have just been dissolved.

Affiliations:

Links toward previous steps (curation, corpus...)

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to stream PascalFrancis, to step Curation: 000548
to stream PascalFrancis, to step Checkpoint: 000510
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to stream Main, to step Curation: 000E18

Le document en format XML

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<term>Solubilité</term>
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<term>Indium alliage</term>
<term>Alliage binaire</term>
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<front><div type="abstract" xml:lang="en">The applicability of the Tu-Turnbull and Zieba-Pawlowski diffusion models of discontinuous dissolution have been considered. The simulation procedure applied to the Ni-1.4 at.%. In alloy has shown a much better applicability of the Zieba-Pawlowski model than the Tu-Turnbull model for the prediction of the In concentration profiles left behind the receding reaction front. This comes from the fact that in the Tu-Turnbull model the same ratio between migration velocity and grain boundary diffusivity is assumed for both discontinuous precipitation and dissolution processes. This is only true when the difference between temperatures of discontinuous precipitation and subsequent discontinuous dissolution is relatively small. It has also been shown that the results of simulation become better with an increase of the residual supersaturation of the depleted α lamellae as well as with an increase of the characteristic solute concentration left at the places where the β lamellae have just been dissolved.</div>
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Prediction of solute concentration profiles for discontinuous dissolution

Prediction of solute concentration profiles for discontinuous dissolution

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri