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Microstructures in a ternary eutectic alloy: devising metrics based on neighbourhood relationships

Dennstedt, Anne and Choudhury, A. and Ratke, Lorenz and Nestler, B. (2016) Microstructures in a ternary eutectic alloy: devising metrics based on neighbourhood relationships. IOP Conference Series : Materials Science and Engineering, 117, 012025. Institute of Physics (IOP) Publishing. DOI: 10.1088/1757-899X/117/1/012025 ISSN 1757-8981

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Abstract

Ternary eutectics, where three phases form simultaneously from the melt, present an opportunity to study the fundamental science of microstructural pattern formation during the process of solidification. In this paper we investigate these phenomena, both experimentally and by phase-field simulations. The aim is to develop necessary characterisation tools which can be applied to both experimentally determined and simulated microstructures for a quantitative comparison between simulations and experiments. In SEM images of experimental cross sections of directionally solidified Ag-Al-Cu ternary eutectic alloy at least six different types of microstructures are observed. Corresponding 3D phase-field simulations for different solidification conditions and compositions allow us to span and isolate the material parameters which influence the formation of three-phase patterns. Both experimental and simulated microstructures were analysed regarding interface lengths, triple points and number of neighbours. As a result of this integrated experimental and computational effort we conclude that neighbourhood relationships as described herein, turn out to be an appropriate basis to characterise order in patterns

Item URL in elib:https://elib.dlr.de/104971/
Document Type:Article
Title:Microstructures in a ternary eutectic alloy: devising metrics based on neighbourhood relationships
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dennstedt, AnneAnne.Dennstedt (at) dlr.deUNSPECIFIED
Choudhury, A.Indian Institute of Science, Department of Materials Engineering, 560012 Bangalore, IndiaUNSPECIFIED
Ratke, Lorenzlorenz.ratke (at) dlr.deUNSPECIFIED
Nestler, B.Institut für Angewandte Materialien, Karlsruhe Institut für Technologie, 76131 Karlsruhe, GermanyUNSPECIFIED
Date:2016
Journal or Publication Title:IOP Conference Series : Materials Science and Engineering
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:No
In ISI Web of Science:No
Volume:117
DOI :10.1088/1757-899X/117/1/012025
Page Range:012025
Publisher:Institute of Physics (IOP) Publishing
ISSN:1757-8981
Status:Published
Keywords:directional solidification; Al-Ag-Cu alloy; solidification microstructure; ternary eutectic alloy; phase-field simulation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialdesign und neue Materialien, R - Vorhaben Materialforschung und Mikrogravitation (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Kargl, Dr Florian
Deposited On:04 Jul 2016 07:06
Last Modified:08 Mar 2018 18:53

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