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Instabilities in the periodic arrangement of elastically interacting precipitates in nickel-base superalloys
- Source :
- Acta Materialia, Acta Materialia, Elsevier, 2020, 187, pp.41-50. ⟨10.1016/j.actamat.2020.01.022⟩
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- 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.
- Subjects :
- 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
Subjects
Details
- ISSN :
- 13596454
- Volume :
- 187
- Database :
- OpenAIRE
- Journal :
- Acta Materialia
- Accession number :
- edsair.doi.dedup.....e2f17b115d093084e8d042fd79733972