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Large-scale phase-field simulations of ternary eutectic microstructure evolution

Steinmetz, Philipp and Hötzer, Johannes and Kellner, Michael and Dennstedt, Anne and Nestler, Britta (2016) Large-scale phase-field simulations of ternary eutectic microstructure evolution. Computational Materials Science, 117, pp. 205-214. Elsevier. doi: 10.1016/j.commatsci.2016.02.001. ISSN 0927-0256.

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Abstract

The microstructure evolution of ternary eutectic alloys is subject of current research for multicomponent alloys, due to the large variety of patterns and their widely adjustable properties. In experiments, contact zones between the different aligned patterns are commonly observed. However, their formation and influence on the microstructure evolution was not yet investigated. To study 3D patterns and the integrated contact zones, large-scale phase-field simulations of an idealized system are conducted, enabling the quantification of the rod shapes. First, the lamellar spacing with the minimum undercooling lambda_JH from the Jackson–Hunt approach is numerically determined. Then, the domain size and initial filling are systematically varied, to analyze the influence of these two quantities on the pattern formation and to determine the required computational domain size for statistical volume elements (SVE). The statistical measures indicate a minimum size of 400 x 400 voxel cells, equivalent to 4.3lambda_JH x 4.3lambda_JH , parallel to the solidification front and the necessity of large scale simulations to resolve SVEs. Different stable patterns, beside the hexagonal structures, are found, depending on the domain size, the initial filling and the undercooling of these patterns. In large-scale simulations, the formation and evolution of contact zones is observed, which are reported from experiments.

Item URL in elib:https://elib.dlr.de/104973/
Document Type:Article
Title:Large-scale phase-field simulations of ternary eutectic microstructure evolution
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Steinmetz, PhilippInstitute for Applied Materials - Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), KarlsruheUNSPECIFIED
Hötzer, JohannesInstitute for Applied Materials - Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), KarlsruheUNSPECIFIED
Kellner, MichaelInstitute for Applied Materials - Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), KarlsruheUNSPECIFIED
Dennstedt, AnneAnne.Dennstedt (at) dlr.deUNSPECIFIED
Nestler, BrittaInstitute for Applied Materials - Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), KarlsruheUNSPECIFIED
Date:2016
Journal or Publication Title:Computational Materials Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:117
DOI :10.1016/j.commatsci.2016.02.001
Page Range:pp. 205-214
Publisher:Elsevier
ISSN:0927-0256
Status:Published
Keywords:Solidification microstructure; Three-dimensional; Large-scale; Ternary eutectic alloys; Pattern selection
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 - Research under Space Conditions
DLR - Research theme (Project):R - Material Design and New Materials, R - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Kargl, Dr Florian
Deposited On:04 Jul 2016 07:05
Last Modified:06 Sep 2019 15:24

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