Characterization of bulk bimodal polycrystalline nickel deformed by direct impact loadings
| Autor: | Gábor Csiszár, David Tingaud, Guy Dirras, H. Couque, Jenő Gubicza, Frédéric Mompiou |
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| Přispěvatelé: | Laboratoire des Sciences des Procédés et des Matériaux (LSPM), Centre National de la Recherche Scientifique (CNRS)-Université Sorbonne Paris Cité (USPC)-Institut Galilée-Université Paris 13 (UP13), Eötvös Loránd University (ELTE), Nexter Munitions, Nexter, Centre d'élaboration de matériaux et d'études structurales (CEMES), 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 Paris 13 (UP13)-Institut Galilée-Université Sorbonne Paris Cité (USPC)-Centre National de la Recherche Scientifique (CNRS), 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) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Dislocation densities Cracks Grain fragmentation Velocity Spark plasma sintering chemistry.chemical_element Line profile analysis 02 engineering and technology Micro-structure evolutions 01 natural sciences Nickel 0103 physical sciences Nanohardness General Materials Science X-ray line profile analysis Composite material Microstructure Polycrystalline nickels 010302 applied physics [PHYS]Physics [physics] Micrometer sized particles Mechanical Engineering Metallurgy 021001 nanoscience & nanotechnology Condensed Matter Physics Impact chemistry Dislocations (crystals) Mechanics of Materials Impact loading Nanometre Crystallite Dislocation 0210 nano-technology Bi-modal microstructures |
| Zdroj: | Materials Science and Engineering: A Materials Science and Engineering: A, Elsevier, 2014, 601, pp.48-57. ⟨10.1016/j.msea.2014.02.043⟩ Materials Science and Engineering: A, 2014, 601, pp.48-57. ⟨10.1016/j.msea.2014.02.043⟩ |
| ISSN: | 0921-5093 |
| Popis: | cited By 8; International audience; Spark plasma sintering of a blend of powders with nanometer and micrometer sized particles yielded to a composite-like nickel microstructure consisting of ultrafine-grained (UFG) and coarse-grained (CG) volumes with the fractions of 36% and 64%, respectively. Microstructure evolution and nanohardness distributions of specimens submitted to impact loading at various velocities between 12 and 50ms-1 were determined. At a velocity of 12ms-1, cracks were formed in the UFG regions but they were stopped by the CG entities. Higher velocities resulted in crack-free microstructures and considerable grain fragmentation within CG regions. X-ray line profile analysis investigations showed a decrease of mean crystallite size from ~104 (initial state) to ~41nm (highest velocity). The dislocation density first increased up to 20ms-1 then it decreased considerably with increasing impact velocity, indicating recovery in the microstructure due to the conversion of plastic work into heat. Accordingly, the average nanohardness decreased with increasing the velocity from 20 to 31ms-1. No difference between the microstructures impacted at 31 and 50ms-1 was observed. |
| Databáze: | OpenAIRE |
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