Instabilities in the periodic arrangement of elastically interacting precipitates in nickel-base superalloys
| Autor: | Y. Le Bouar, Mikael Perrut, Benoît Appolaire, M. Degeiter, A. Finel |
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| Přispěvatelé: | DMAS, ONERA, Université Paris Saclay (COmUE) [Châtillon], ONERA-Université Paris Saclay (COmUE), LEM, UMR 104, CNRS-ONERA, Université Paris-Saclay (Laboratoire d'étude des microstructures), ONERA-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2020 |
| Předmět: |
PATTERN FORMATION
STABILITY ANALYSES Materials science Polymers and Plastics ANALYSES DE STABILITÉ SINGLE-CRYSTAL SUPERALLOY Pattern formation ELASTICITE 02 engineering and technology Cubic crystal system 01 natural sciences Instability [SPI.MAT]Engineering Sciences [physics]/Materials 0103 physical sciences SUPERALLIAGE MONOCRISTALIN CHAMPS DE PHASE Elasticity (economics) MORPHOGENESE 010302 applied physics Condensed matter physics ELASTICITY Metals and Alloys 021001 nanoscience & nanotechnology Microstructure Electronic Optical and Magnetic Materials Superalloy PHASE FIELD Transverse plane Volume fraction Ceramics and Composites MICROSTRUCTURE 0210 nano-technology |
| Zdroj: | Acta Materialia Acta Materialia, Elsevier, 2020, 187, pp.41-50. ⟨10.1016/j.actamat.2020.01.022⟩ |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2020.01.022 |
| Popis: | Nickel-base superalloys display cuboidal precipitates aligned along the cubic directions, which are the elastic soft directions. At high precipitate volume fraction, the microstructure is often described as a regular array of precipitates organized on a simple cubic macro-lattice. In the present work, we use a stability analysis and 3D phase field simulations to show that such a regular array is in fact unstable whatever the volume fraction of precipitates. The two main instability modes are the longitudinal [100] mode and the transverse [110] mode along the [ 1 1 ¯ 0 ] eigenvector. We argue that these instabilities lead to formation of configurational defects closely related to experimentally observed branches and herringbone patterns. The roles of elastic anisotropy and elastic homogeneity are also discussed. |
| Databáze: | OpenAIRE |
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