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Influence of growth velocity variations on the pattern formation during the directional solidification of ternary eutectic Al-Ag-Cu

Hötzer, Johannes and Steinmetz, P. and Dennstedt, Anne and Genau, Amber and Kellner, Michael and Sargin, Irmak and Nestler, Britta (2017) Influence of growth velocity variations on the pattern formation during the directional solidification of ternary eutectic Al-Ag-Cu. Acta Materialia, 136, pp. 335-346. Elsevier. doi: https://doi.org/10.1016/j.actamat.2017.07.007. ISSN 1359-6454.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S1359645417305554?via%3Dihub

Abstract

In order to control the evolving microstructure in complex eutectics and other multi-phase systems, it is important to understand the adjustment mechanisms and the parameters that determine pattern evolution. Here, a combined experimental and simulation approach is taken to investigate the response of a three-phase eutectic system to changes in solidification velocity. Using Al-Ag-Cu as a model system, large scale three-dimensional phase-field simulations are compared to directionally solidified samples containing both, velocity increases and decreases. The experimental results are obtained by synchrotron tomography for detailed consideration of the microstructure directly before and after a targeted velocity change and by traditional SEM analysis of sample cross sections to capture effects over longer length scales. In addition to qualitative analysis of the images, the microstructures are statistically assessed using phase fractions, shape factor and nearest neighbor statistics. Both, simulation and experiment show an immediate change in phase fraction as a result of a change in growth velocity. Adjustment of the microstructural pattern occurs more slowly over a relatively long length scale, due to splitting, merging and overgrowing events. Novel quantification techniques emphasize that ternary eutectic phase arrangements are complex and continuously evolving structures which, even under ideal conditions, do not reach steady state growth as quickly as previously believed.

Item URL in elib:https://elib.dlr.de/123914/
Document Type:Article
Title:Influence of growth velocity variations on the pattern formation during the directional solidification of ternary eutectic Al-Ag-Cu
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hötzer, JohannesInstitute for Applied Materials - Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), KarlsruheUNSPECIFIED
Steinmetz, P.Institut für Angewandte Materialien, Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), KarlsruheUNSPECIFIED
Dennstedt, AnneAnne.Dennstedt (at) dlr.deUNSPECIFIED
Genau, Amberamber.genau (at) uab.eduUNSPECIFIED
Kellner, MichaelInstitute for Applied Materials - Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), KarlsruheUNSPECIFIED
Sargin, IrmakDepartment of Materials Science and Engineering, Iowa State University, 2220 Hoover Hall, Ames, IA, 50011-2300, USAUNSPECIFIED
Nestler, BrittaInstitute for Applied Materials - Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), KarlsruheUNSPECIFIED
Date:July 2017
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:136
DOI :https://doi.org/10.1016/j.actamat.2017.07.007
Page Range:pp. 335-346
Publisher:Elsevier
ISSN:1359-6454
Status:Published
Keywords:Simulation and experiment Velocity changes Ternary eutectic Directional solidification Al-Ag-Cu
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
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Kargl, Dr Florian
Deposited On:29 Nov 2018 14:44
Last Modified:29 Nov 2018 14:44

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