Coexistence of rod-like and lamellar eutectic growth patterns

Autor: Silvère Akamatsu, Sabine Bottin-Rousseau, V.T. Witusiewicz, José L. Fernández, Ulrike Hecht, Ana Laverón-Simavilla
Přispěvatelé: Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), ACCESS (GERMANY), Universidad Politécnica de Madrid (UPM), GDR 2799 Micropesanteur Fondamentale & Appliquée, Akamatsu, Silvère
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Materials science
directional solidification
01 natural sciences
Instability
010305 fluids & plasmas
Physics::Fluid Dynamics
[NLIN.NLIN-PS]Nonlinear Sciences [physics]/Pattern Formation and Solitons [nlin.PS]
0103 physical sciences
[NLIN.NLIN-PS] Nonlinear Sciences [physics]/Pattern Formation and Solitons [nlin.PS]
General Materials Science
Lamellar structure
Composite material
010306 general physics
ComputingMilieux_MISCELLANEOUS
Directional solidification
Eutectic system
Mechanical Engineering
Metals and Alloys
Front (oceanography)
Condensed Matter Physics
microgravity
[PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
in situ experimentation
Condensed Matter::Soft Condensed Matter
Faceting
Transverse plane
Temperature gradient
Mechanics of Materials
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Eutectic growth
Zdroj: Scripta Materialia
Scripta Materialia, Elsevier, 2022, 207, pp.114314
ISSN: 1359-6462
Popis: We present the first observations of a large-scale coexistence between rod-like and lamellar eutectic growth patterns during directional solidification of a eutectic alloy. In situ experiments with real-time optical monitoring were carried out under microgravity onboard the International Space Station (ISS). We used the transparent succinonitrile-d,camphor eutectic alloy that ordinarily forms rod-like patterns. At low growth velocity, short lamellae stabilized at the contact line with a sample glass wall. In the presence of a controlled transverse temperature gradient, the coupled-growth pattern experienced a global drift along an inclined isotherm, and a stable lamellar domain spread over the solidification front. The propagative nature of the lamellar-to-rod transition was evidenced. The advance of the lamellar/rod domain boundary was determined by a slowly amplifying varicose instability of the lamellae. On a large scale, the domain boundary underwent a dynamic faceting.
Databáze: OpenAIRE
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