elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Graph-based investigation of three-dimensional microstructure rearrangement during ternary eutectic directional solidification of Al-Ag-Cu

Steinmetz, P. and Hötzer, Johannes and Dennstedt, Anne and Serr, Christopher and Nestler, Britta and Genau, Amber (2018) Graph-based investigation of three-dimensional microstructure rearrangement during ternary eutectic directional solidification of Al-Ag-Cu. Journal of Crystal Growth, 498, pp. 230-243. Elsevier. doi: https://doi.org/10.1016/j.jcrysgro.2018.06.028. ISSN 0022-0248.

Full text not available from this repository.

Official URL: https://www.sciencedirect.com/science/article/pii/S0022024818303026

Abstract

In order to control macroscopic material properties, it is important to understand the fundamental mechanisms of microstructure evolution during solidification. Varying the solidification velocity in eutectic alloys can result in both a change in microstructural length scale and different patterns. In a structure consisting of rods or fibers aligned in the growth direction, the adjustment mechanisms for this kind of pattern evolution consist of merging and overgrowing events for coarsening, and splitting and nucleation events for refinement. To gain a better understanding of these mechanisms during three-dimensional ternary eutectic solidification, the distribution of these four types of events is quantitatively assessed using graph based analysis of a three-dimensional data set obtained by synchrotron tomography of a solidified ternary eutectic Al-Ag-Cu alloy. The results demonstrate that the amount of microstructural change events is larger for higher growth velocities. It is found that the microstructure adjustment under steady growth conditions, i.e. constant composition, constant solidification velocity and constant temperature gradient, is dominated by splitting and merging events, while the coarsening due to a velocity decrease occurs by rod termination via overgrowth. The comparison of the microstructure rearrangement of samples with different patterns and constant growth conditions show that, depending on the growth velocity, certain microstructure arrangements have a lower tendency to rearrange. The quantitative analysis of the rearrangement mechanisms lead to a better understanding of the microstructure evolution in complex eutectic alloys.

Item URL in elib:https://elib.dlr.de/123912/
Document Type:Article
Title:Graph-based investigation of three-dimensional microstructure rearrangement during ternary eutectic directional solidification of Al-Ag-Cu
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Steinmetz, P.Institut für Angewandte Materialien, 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
Dennstedt, AnneAnne.Dennstedt (at) dlr.deUNSPECIFIED
Serr, Christophernstitute of Materials and Processes, Karlsruhe University of Applied Sciences, Moltkestrasse 30, D 76133 Karlsruhe, GermanyUNSPECIFIED
Nestler, BrittaInstitute for Applied Materials - Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), KarlsruheUNSPECIFIED
Genau, Amberamber.genau (at) uab.eduUNSPECIFIED
Date:June 2018
Journal or Publication Title:Journal of Crystal Growth
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:498
DOI :https://doi.org/10.1016/j.jcrysgro.2018.06.028
Page Range:pp. 230-243
Publisher:Elsevier
ISSN:0022-0248
Status:Published
Keywords:Experiment Velocity changes Ternary eutectic Directional solidification Al-Ag-Cu Synchrotron tomography Graph-based analysis
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 14:43
Last Modified:29 Nov 2018 14:43

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.