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Dislocation reactions,plastic anisotropy and forest strengthening in MgO at high temperature
Affiliation:1. Unité Matériaux et Transformations, UMR CNRS 8207, Université de Lille 1, Cité Scientifique, 59655 Villeneuve d’Ascq, France;2. Laboratoire d’Etude des Microstructures, UMR 104, CNRS-ONERA, 29 avenue de la Division Leclerc, 92322 Chatillon, France;1. Bayerisches Geoinstitut, University of Bayreuth, 95440 Bayreuth, Germany;2. Institute for Geosciences, Mineralogy Dept., University of Jena, 07745 Jena, Germany;3. Center for Advanced Radiation Sources, University of Chicago, Chicago, IL 60439, USA;1. ENEA, CR Casaccia, Via Anguillarese 301, Santa Maria di Galeria, 00123 Rome, Italy;2. International Research Center for Mathematics & Mechanics of Complex System (MEMOCS), University of L’Aquila, Via S Pasquale, 04012 Cisterna di Latina (LT), Italy;3. ASSOINGE R&D, K. Doormanlaan, 10-2283 AS Rijswijk, The Netherlands;4. Union–Nikola Tesla University, Cara Dusana 62-64, 11000 Belgrade, Serbia;1. Department of Civil, Environmental, Territory Engineering and Architecture, University of Parma, Viale G.P. Usberti 181/A, 43100 Parma, Italy;2. Novatek s.r.l., Via dell’Artigianato 11, 37021 Bosco Chiesanuova (VR), Italy;1. Geosciences Montpellier, CNRS & Université de Montpellier, F-34095 Montpellier cedex 5, France;2. Univ. Lille, CNRS, INRA, ENSCL, UMR 8207 – UMET – Unité Matériaux et Transformations, F-59000 Lille, France;1. Department of Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool, UK;2. Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, USA;3. Department of Geology, Chulalongkorn University, Bangkok, Thailand;4. Department of Earth and Planetary Science, University of California, Berkeley, CA, USA;5. Advanced Photon Source, Argonne National Laboratory, Lemont, IL, USA;6. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;7. Material Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, USA;1. Bayerisches Geoinstitut BGI, University of Bayreuth, 95440 Bayreuth, Germany;2. University of Utah, 115 So. 1460 E., Salt Lake City, UT 84112-0111, USA;3. German Research Center for Geosciences GFZ, 14473 Potsdam, Germany;4. Univ. Lille, CNRS, INRA, ENSCL, UMR 8207 – UMET – Unité Matériaux et Transformations, F-59000 Lille, France;5. Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
Abstract:The collective properties of dislocations in MgO are investigated in the high temperature regime and at constant strain rate with 3D Dislocation Dynamics simulations. Intersections between slip systems 1/2〈1 1 0〉{1 1 0} and 1/2〈1 1 0〉{1 0 0} allow essentially two types of junction reactions. These junctions are energetically stable and are expected to promote strong forest strengthening at high temperature. Large-scale DD simulations show that MgO strain hardening at high temperature may be dominated by forest reactions. Important parameters for dislocation density based modeling of MgO plasticity are finally calculated and verified to be consistent with experimental observations.
Keywords:MgO  Plasticity  Dislocation Dynamics simulation  Forest strengthening
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