A mechanical interpretation of the activation energy of high temperature deformation in two phase materials
Identifieur interne : 000613 ( Main/Exploration ); précédent : 000612; suivant : 000614A mechanical interpretation of the activation energy of high temperature deformation in two phase materials
Auteurs : L. Briottet [France, Canada] ; J. J. Jonas [Canada] ; F. Montheillet [France]Source :
- Acta Materialia [ 1359-6454 ] ; 1995.
Abstract
The deformation of two phase materials is analyzed and a mechanical model is derived for calculating the apparent activation energy of flow. The latter is expressed in terms of the individual activation energies of the two constituent phases. The model is used to account for the observation that the activation energy for two phase flow is generally much higher or much lower than the flow activation energies of the individual phases. This is because the apparent activation energy of the aggregate includes an additional term that depends on the rate of change with temperature of the volume fractions of the two phases. The predictions of the model are compared to experimental results and are shown to be in good agreement with them. The present mechanical approach demonstrates clearly that the apparent activation energy for the flow of a two phase material is not, in general, related to a specific mechanism since an additional mesoscopic term is involved.
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DOI: 10.1016/1359-6454(95)00257-X
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Briottet</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Ecole des Mines de Saint-Etienne, Centre SMS, URA CNRS 1884 Laboratoire Microstructures et Mise en Forme, 158 cours Fauriel, 42023 Saint-Etienne Cedex 2</wicri:regionArea><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Saint-Etienne</settlement></placeName></affiliation><affiliation wicri:level="4"><country>Canada</country><wicri:regionArea>† Presently on leave at Department of Metallurgical Engineering, McGill University, 3450 University Street, Montreal (Quebec)</wicri:regionArea><orgName type="university">Université McGill</orgName><placeName><settlement type="city">Montréal</settlement><region type="state">Québec</region></placeName></affiliation></author><author><name sortKey="Jonas, J J" sort="Jonas, J J" uniqKey="Jonas J" first="J. J." last="Jonas">J. J. Jonas</name><affiliation wicri:level="4"><country>Canada</country><wicri:regionArea>Department of Metallurgical Engineering, McGill University, 3450 University Street, Montreal (Quebec</wicri:regionArea><orgName type="university">Université McGill</orgName><placeName><settlement type="city">Montréal</settlement><region type="state">Québec</region></placeName></affiliation></author><author><name sortKey="Montheillet, F" sort="Montheillet, F" uniqKey="Montheillet F" first="F." last="Montheillet">F. Montheillet</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Ecole des Mines de Saint-Etienne, Centre SMS, URA CNRS 1884 Laboratoire Microstructures et Mise en Forme, 158 cours Fauriel, 42023 Saint-Etienne Cedex 2</wicri:regionArea><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Saint-Etienne</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Acta Materialia</title><title level="j" type="abbrev">AM</title><idno type="ISSN">1359-6454</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1995">1995</date><biblScope unit="volume">44</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="1665">1665</biblScope><biblScope unit="page" to="1672">1672</biblScope></imprint><idno type="ISSN">1359-6454</idno></series><idno type="istex">C961ED796912894F045775527A800E8D42FDB83B</idno><idno type="DOI">10.1016/1359-6454(95)00257-X</idno><idno type="PII">1359-6454(95)00257-X</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1359-6454</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The deformation of two phase materials is analyzed and a mechanical model is derived for calculating the apparent activation energy of flow. The latter is expressed in terms of the individual activation energies of the two constituent phases. The model is used to account for the observation that the activation energy for two phase flow is generally much higher or much lower than the flow activation energies of the individual phases. This is because the apparent activation energy of the aggregate includes an additional term that depends on the rate of change with temperature of the volume fractions of the two phases. The predictions of the model are compared to experimental results and are shown to be in good agreement with them. The present mechanical approach demonstrates clearly that the apparent activation energy for the flow of a two phase material is not, in general, related to a specific mechanism since an additional mesoscopic term is involved.</div></front></TEI><affiliations><list><country><li>Canada</li><li>France</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Québec</li><li>Rhône-Alpes</li></region><settlement><li>Montréal</li><li>Saint-Etienne</li></settlement><orgName><li>Université McGill</li></orgName></list><tree><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Briottet, L" sort="Briottet, L" uniqKey="Briottet L" first="L." last="Briottet">L. Briottet</name></region><name sortKey="Montheillet, F" sort="Montheillet, F" uniqKey="Montheillet F" first="F." last="Montheillet">F. Montheillet</name></country><country name="Canada"><region name="Québec"><name sortKey="Briottet, L" sort="Briottet, L" uniqKey="Briottet L" first="L." last="Briottet">L. Briottet</name></region><name sortKey="Jonas, J J" sort="Jonas, J J" uniqKey="Jonas J" first="J. J." last="Jonas">J. J. Jonas</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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