Effect of equal channel angular pressing on the Portevin-Le Chatelier effect in an Al3Mg alloy
Identifieur interne : 004192 ( Main/Exploration ); précédent : 004191; suivant : 004193Effect of equal channel angular pressing on the Portevin-Le Chatelier effect in an Al3Mg alloy
Auteurs : T. A. Lebedkina [France] ; M. A. Lebyodkin [France] ; T. T. Lamark [Norvège] ; M. Janecek [République tchèque] ; Y. Estrin [Australie, Russie]Source :
- Materials science & engineering. A, Structural materials : properties, microstructure and processing [ 0921-5093 ] ; 2014.
Descripteurs français
- Pascal (Inist)
- Extrusion angulaire section constante, Effet Portevin Le Châtelier, Déformation plastique, Instabilité, Propriété mécanique, Grande déformation, Affinement grain, Effet contrainte, Déformation dent de scie, Fluctuation, Courbe déformation, Modèle statistique, Méthode échelle multiple, Série temporelle, Criticalité autoorganisée, Synchronisation, Dislocation, Analyse statistique, Autoorganisation, 6172L, 8140G.
English descriptors
- KwdEn :
- Deformation curve, Dislocations, ECAP, Fluctuations, Grain refinement, High strain, Instability, Mechanical properties, Multiscale method, Plastic deformation, Portevin Le Chatelier effect, Self organization, Self-organized criticality, Serrated yielding, Statistical analysis, Statistical models, Stress effects, Synchronization, Time series.
Abstract
Plastic deformation of alloys is often accompanied with discontinuous flow known as the Portevin-Le Chatelier (PLC) instability. Recent studies of mechanical behavior of alloys subjected to severe plastic deformation (SPD) revealed different forms this phenomenon can take as a result of grain refinement. In the present work, it is reported that SPD may effectively suppress the macroscopic stress serrations characteristic of the PLC effect. At the same time, small-scale stress fluctuations can still be resolved on the deformation curves. To investigate their nature, stress vs time curves for an A13Mg alloy processed by equal channel angular pressing (ECAP) are compared with those obtained for the initial coarse-grained (CG) material, using statistical and multifractal approaches to multi-scale analysis of time series. An interpretation of the results in terms of the concurrency of phenomena of self-organized criticality and synchronization in the dislocation system is proposed.
Affiliations:
- Australie, France, Norvège, Russie, République tchèque
- District fédéral central, Grand Est, Lorraine (région)
- Metz, Moscou, Nancy
- Université de Lorraine
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Le document en format XML
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A." last="Lebedkina">T. A. Lebedkina</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>LEM3, CNRS, Université de Lorraine, UMR 7239</s1><s2>Ile du Saulcy, 57045 Metz</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region><settlement type="city">Metz</settlement><settlement type="city">Nancy</settlement></placeName><orgName type="university">Université de Lorraine</orgName></affiliation></author><author><name sortKey="Lebyodkin, M A" sort="Lebyodkin, M A" uniqKey="Lebyodkin M" first="M. A." last="Lebyodkin">M. A. 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A Struct. mater. prop. microstruct. proces.</title><idno type="ISSN">0921-5093</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Deformation curve</term><term>Dislocations</term><term>ECAP</term><term>Fluctuations</term><term>Grain refinement</term><term>High strain</term><term>Instability</term><term>Mechanical properties</term><term>Multiscale method</term><term>Plastic deformation</term><term>Portevin Le Chatelier effect</term><term>Self organization</term><term>Self-organized criticality</term><term>Serrated yielding</term><term>Statistical analysis</term><term>Statistical models</term><term>Stress effects</term><term>Synchronization</term><term>Time series</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Extrusion angulaire section constante</term><term>Effet Portevin Le Châtelier</term><term>Déformation plastique</term><term>Instabilité</term><term>Propriété mécanique</term><term>Grande déformation</term><term>Affinement grain</term><term>Effet contrainte</term><term>Déformation dent de scie</term><term>Fluctuation</term><term>Courbe déformation</term><term>Modèle statistique</term><term>Méthode échelle multiple</term><term>Série temporelle</term><term>Criticalité autoorganisée</term><term>Synchronisation</term><term>Dislocation</term><term>Analyse statistique</term><term>Autoorganisation</term><term>6172L</term><term>8140G</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Plastic deformation of alloys is often accompanied with discontinuous flow known as the Portevin-Le Chatelier (PLC) instability. Recent studies of mechanical behavior of alloys subjected to severe plastic deformation (SPD) revealed different forms this phenomenon can take as a result of grain refinement. In the present work, it is reported that SPD may effectively suppress the macroscopic stress serrations characteristic of the PLC effect. At the same time, small-scale stress fluctuations can still be resolved on the deformation curves. To investigate their nature, stress vs time curves for an A13Mg alloy processed by equal channel angular pressing (ECAP) are compared with those obtained for the initial coarse-grained (CG) material, using statistical and multifractal approaches to multi-scale analysis of time series. An interpretation of the results in terms of the concurrency of phenomena of self-organized criticality and synchronization in the dislocation system is proposed.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>Norvège</li><li>Russie</li><li>République tchèque</li></country><region><li>District fédéral central</li><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Metz</li><li>Moscou</li><li>Nancy</li></settlement><orgName><li>Université de Lorraine</li></orgName></list><tree><country name="France"><region name="Grand Est"><name sortKey="Lebedkina, T A" sort="Lebedkina, T A" uniqKey="Lebedkina T" first="T. A." last="Lebedkina">T. A. Lebedkina</name></region><name sortKey="Lebyodkin, M A" sort="Lebyodkin, M A" uniqKey="Lebyodkin M" first="M. A." last="Lebyodkin">M. A. Lebyodkin</name></country><country name="Norvège"><noRegion><name sortKey="Lamark, T T" sort="Lamark, T T" uniqKey="Lamark T" first="T. T." last="Lamark">T. T. Lamark</name></noRegion></country><country name="République tchèque"><noRegion><name sortKey="Janecek, M" sort="Janecek, M" uniqKey="Janecek M" first="M." last="Janecek">M. Janecek</name></noRegion></country><country name="Australie"><noRegion><name sortKey="Estrin, Y" sort="Estrin, Y" uniqKey="Estrin Y" first="Y." last="Estrin">Y. Estrin</name></noRegion></country><country name="Russie"><region name="District fédéral central"><name sortKey="Estrin, Y" sort="Estrin, Y" uniqKey="Estrin Y" first="Y." last="Estrin">Y. Estrin</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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