Influence of recovery on dynamic segregation of sulphur to surface of cold rolled nickel
Identifieur interne : 000335 ( France/Analysis ); précédent : 000334; suivant : 000336Influence of recovery on dynamic segregation of sulphur to surface of cold rolled nickel
Auteurs : R. Louahdi [Algérie] ; G. Saindrenan [France] ; R. Le Gall [France] ; G. Liao [France] ; P. Paillard [France]Source :
- Materials science and technology [ 0267-0836 ] ; 2001.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Nickel.
English descriptors
- KwdEn :
Abstract
It is now well established that the kinetics of impurity segregation is greatly increased by the defect annihilation process occurring during the return to equilibrium of a material initially in a metastable state (quenched, irradiated, cold worked). During the return to equilibrium of a cold worked material, i.e. during a recrystallisation anneal, both the recovery and recrystallisation stages contribute to the acceleration of the segregation kinetics. In this work, an attempt is made to study the contribution of each stage separately, with particular emphasis on the recovery mechanisms of cold worked pure nickel and the way these mechanisms affect sulphur segregation taking place in this material. For this purpose, recrystallisation and segregation anneals at 455°C were carried out on lightly (0.25 true strain) and heavily (0.8 true strain) cold rolled nickel. It was found that sulphur segregation in the lightly deformed material took place entirely during the incubation time preceding recrystallisation, i.e. during the recovery stage. The process is thought to involve dislocation pipe diffusion for which a diffusion coefficient of 6.4 x 10-9 m2 s-1 was estimated. In the heavily deformed material, segregation was concomitant with recrystallisation and the mechanism thought to be most probable is that involving impurity drag.
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Pascal:01-0140850Le document en format XML
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Louahdi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institut d'Optique et de Mécanique de Precision, Université Ferhat Abbas</s1><s2>Sétif 19000</s2><s3>DZA</s3><sZ>1 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Sétif 19000</wicri:noRegion></affiliation></author><author><name sortKey="Saindrenan, G" sort="Saindrenan, G" uniqKey="Saindrenan G" first="G." last="Saindrenan">G. Saindrenan</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Laboratoire Génie des Matériaux, ISITEM, Université de Nantes, La Chantrerie, Rue Christian Pauc, CP 3023</s1><s2>44087 Nantes</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName><orgName type="university">Université de Nantes</orgName></affiliation></author><author><name sortKey="Le Gall, R" sort="Le Gall, R" uniqKey="Le Gall R" first="R." last="Le Gall">R. Le Gall</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Laboratoire Génie des Matériaux, ISITEM, Université de Nantes, La Chantrerie, Rue Christian Pauc, CP 3023</s1><s2>44087 Nantes</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName><orgName type="university">Université de Nantes</orgName></affiliation></author><author><name sortKey="Liao, G" sort="Liao, G" uniqKey="Liao G" first="G." last="Liao">G. Liao</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Laboratoire Génie des Matériaux, ISITEM, Université de Nantes, La Chantrerie, Rue Christian Pauc, CP 3023</s1><s2>44087 Nantes</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName><orgName type="university">Université de Nantes</orgName></affiliation></author><author><name sortKey="Paillard, P" sort="Paillard, P" uniqKey="Paillard P" first="P." last="Paillard">P. Paillard</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Laboratoire Génie des Matériaux, ISITEM, Université de Nantes, La Chantrerie, Rue Christian Pauc, CP 3023</s1><s2>44087 Nantes</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName><orgName type="university">Université de Nantes</orgName></affiliation></author></analytic><series><title level="j" type="main">Materials science and technology</title><title level="j" type="abbreviated">Mater. sci. technol.</title><idno type="ISSN">0267-0836</idno><imprint><date when="2001">2001</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Materials science and technology</title><title level="j" type="abbreviated">Mater. sci. technol.</title><idno type="ISSN">0267-0836</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Annealing</term><term>Cold deformation</term><term>Cold rolling</term><term>Crystal defects</term><term>Defect annihilation</term><term>Defect density</term><term>Dislocation climb</term><term>Dislocation density</term><term>Experimental study</term><term>Impurity segregation</term><term>Metastable phases</term><term>Nickel</term><term>Recovery(properties)</term><term>Recrystallization</term><term>Vacancy density</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Recristallisation</term><term>Ségrégation impureté</term><term>Recuit</term><term>Déformation à froid</term><term>Laminage à froid</term><term>Restauration(propriété)</term><term>Annihilation défaut</term><term>Phase métastable</term><term>Densité lacune</term><term>Densité défaut</term><term>Défaut cristallin</term><term>Montée dislocation</term><term>Densité dislocation</term><term>Nickel</term><term>Etude expérimentale</term><term>Ni</term><term>8140E</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Nickel</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">It is now well established that the kinetics of impurity segregation is greatly increased by the defect annihilation process occurring during the return to equilibrium of a material initially in a metastable state (quenched, irradiated, cold worked). During the return to equilibrium of a cold worked material, i.e. during a recrystallisation anneal, both the recovery and recrystallisation stages contribute to the acceleration of the segregation kinetics. In this work, an attempt is made to study the contribution of each stage separately, with particular emphasis on the recovery mechanisms of cold worked pure nickel and the way these mechanisms affect sulphur segregation taking place in this material. For this purpose, recrystallisation and segregation anneals at 455°C were carried out on lightly (0.25 true strain) and heavily (0.8 true strain) cold rolled nickel. It was found that sulphur segregation in the lightly deformed material took place entirely during the incubation time preceding recrystallisation, i.e. during the recovery stage. The process is thought to involve dislocation pipe diffusion for which a diffusion coefficient of 6.4 x 10<sup>-9</sup> m<sup>2</sup> s<sup>-1</sup> was estimated. In the heavily deformed material, segregation was concomitant with recrystallisation and the mechanism thought to be most probable is that involving impurity drag.</div></front></TEI><affiliations><list><country><li>Algérie</li><li>France</li></country><region><li>Pays de la Loire</li></region><settlement><li>Nantes</li></settlement><orgName><li>Université de Nantes</li></orgName></list><tree><country name="Algérie"><noRegion><name sortKey="Louahdi, R" sort="Louahdi, R" uniqKey="Louahdi R" first="R." last="Louahdi">R. Louahdi</name></noRegion></country><country name="France"><region name="Pays de la Loire"><name sortKey="Saindrenan, G" sort="Saindrenan, G" uniqKey="Saindrenan G" first="G." last="Saindrenan">G. Saindrenan</name></region><name sortKey="Le Gall, R" sort="Le Gall, R" uniqKey="Le Gall R" first="R." last="Le Gall">R. Le Gall</name><name sortKey="Liao, G" sort="Liao, G" uniqKey="Liao G" first="G." last="Liao">G. Liao</name><name sortKey="Paillard, P" sort="Paillard, P" uniqKey="Paillard P" first="P." last="Paillard">P. Paillard</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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