Prediction of solute concentration profiles for discontinuous dissolution
Identifieur interne : 000E18 ( Main/Exploration ); précédent : 000E17; suivant : 000E19Prediction of solute concentration profiles for discontinuous dissolution
Auteurs : P. Zieba [Pologne] ; D. Bradai [Algérie] ; W. Gust [Allemagne]Source :
- Zeitschrift für Metallkunde [ 0044-3093 ] ; 1997.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
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.
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Le document en format XML
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<term>Indium alloys</term>
<term>Modeling</term>
<term>Nickel base alloys</term>
<term>Phase transformations</term>
<term>Solubility</term>
<term>Solutes</term>
<term>Theoretical study</term>
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<term>Diffusion(transport)</term>
<term>Transformation phase</term>
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<term>Solubilité</term>
<term>Alliage base nickel</term>
<term>Indium alliage</term>
<term>Alliage binaire</term>
<term>Etude théorique</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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