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Crystal orientation relationships in ternary eutectic Al-Al2Cu-Ag2Al

Steinmetz, Philipp and Dennstedt, Anne and Serefoglu, Melis and Sargin, Irmak and Genau, Amber and Hecht, U. (2018) Crystal orientation relationships in ternary eutectic Al-Al2Cu-Ag2Al. Acta Materialia, 157, pp. 96-105. Elsevier. doi: https://doi.org/10.1016/j.actamat.2018.07.016. ISSN 1359-6454.

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Official URL: https://www.sciencedirect.com/science/article/pii/S1359645418305445

Abstract

The microstructure of ternary eutectic Al-Al2Cu-Ag2Al arranges in several patterns of three solid phases during directional solidification. One key question for understanding the behavior of this system is if and how the patterns depend on crystal orientation relationships (ORs) between the solid phases. In order to study the correlation between the ORs and the evolving patterns for different process conditions, electron backscatter diffraction (EBSD) is performed on samples of directionally solidified ternary eutectic Al-Al2Cu-Ag2Al which have been processed with different solidification velocities and temperature gradients. The results show that characteristic ORs occur, influencing the type of the evolving pattern, the alignment of the phases and the degree of order. For one specific OR the pattern was observed to change in response to an imposed increase in the growth velocity even though the OR was retained. Based on the obtained EBSD results, an explanation for the observed behavior is proposed. For the other ORs, specific microstructures were observed for each of them. The outcomes demonstrate that knowledge about crystal ORs is essential to improve the understanding of the pattern formation in complex eutectic alloys.

Item URL in elib:https://elib.dlr.de/123911/
Document Type:Article
Title:Crystal orientation relationships in ternary eutectic Al-Al2Cu-Ag2Al
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Steinmetz, PhilippInstitut für Angewandte Materialien, Computational Materials Science (IAM-CMS), Karlsruhe Institut für Technologie (KIT), KarlsruheUNSPECIFIED
Dennstedt, AnneAnne.Dennstedt (at) dlr.deUNSPECIFIED
Serefoglu, MelisDepartment of Mechanical Engineering, Koc University, Rumeli Feneri Yolu, 34450, Sariyer, Istanbul, TurkeyUNSPECIFIED
Sargin, IrmakDepartment of Mechanical Engineering, Koc University, Rumeli Feneri Yolu, 34450, Sariyer, Istanbul, TurkeyUNSPECIFIED
Genau, Amberamber.genau (at) uab.eduUNSPECIFIED
Hecht, U.ACCESS eV, AachenUNSPECIFIED
Date:July 2018
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:157
DOI :https://doi.org/10.1016/j.actamat.2018.07.016
Page Range:pp. 96-105
Publisher:Elsevier
ISSN:1359-6454
Status:Published
Keywords:Solidification microstructure Ternary eutectic alloys Al-Ag-Cu alloys Crystal orientation EBSD
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

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