Deformation mechanisms of zirconium alloys after irradiation studied by dislocation dynamics simulations and in situ straining experiments in TEM
| Autor: | Fabien Onimus, Laurent Dupuy, Frédéric Mompiou, Marine Gaumé, Wassim Kassem |
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| Přispěvatelé: | CEA- Saclay (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physique de la Plasticité et Métallurgie (CEMES-PPM), Centre d'élaboration de matériaux et d'études structurales (CEMES), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
In situ Materials science Dynamics (mechanics) Zirconium alloy 02 engineering and technology [CHIM.MATE]Chemical Sciences/Material chemistry Deformation (meteorology) 021001 nanoscience & nanotechnology 01 natural sciences [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph] Deformation mechanism 0103 physical sciences [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Irradiation Composite material Dislocation 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Zirconium in the Nuclear Industry: 19th International Symposium Zirconium in the Nuclear Industry: 19th International Symposium, ASTM STP 1622, ASTM International, 24 p., 2021, 13: 978-0-8031-7690-4. ⟨10.1520/STP162220190036⟩ Zirconium in the Nuclear Industry: 19th International Symposium, ASTM International, pp.319-342, 2021, ⟨10.1520/STP162220190036⟩ |
| DOI: | 10.1520/STP162220190036⟩ |
| Popis: | Symposium held in Manchester, United Kingdom; International audience; Zirconium alloys, used in the nuclear industry, are subjected to neutron irradiation that affects their mechanical properties. At the microscopic scale, neutron irradiation creates small dislocation loops that act as obstacles against dislocation glide explaining the irradiation hardening. Transmission Electron Microscopy observations performed after post-irradiation mechanical tests have shown that loops are swept out by gliding dislocations creating thin zones free of defects. Observations have proven that slip occurs preferably in the basal plane, a puzzling fact as dislocations mainly glide in the prismatic plane in unirradiated conditions. In order to understand this phenomenon, discrete Dislocation Dynamics (DD) simulations, on complex configurations, have been performed. The input parameters of this code have been adjusted on MD simulations. Then interactions between loops and mixed dislocations gliding either in the prismatic or basal plane have been simulated. These simulations show that prismatic glide is always impeded in the mixed-screw direction whereas for basal slip, clearing or a weak interaction occurs in the mixed-screw direction, allowing an easy glide of basal dislocations. Furthermore, all three basal systems can contribute to clearing in the basal plane contrary to prismatic slip. These two reasons explain the easy basal glide and clearing of loops after irradiation.Moreover, in-situ straining experiments inside a TEM have been conducted on ion irradiated recrystallized Zircaloy-4. Several interactions between dislocations and loops have been observed in situ. The DD code has been used to simulate these interactions. A fair agreement is obtained between simulations and experiments, showing the relevance of the DD numerical tool. |
| Databáze: | OpenAIRE |
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