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Solidification sequence and four-phase eutectic in AlSi6Cu4Fe2 alloy

Oquab, Djar and Josse, Claudie and Proietti, Arnaud and Pugliara, Alessandro and Lacaze, Jacques and Steinbach, Sonja and Ferdian, Denis and Viguier, Bernard (2019) Solidification sequence and four-phase eutectic in AlSi6Cu4Fe2 alloy. Materials Characterization, 156, p. 109846. Elsevier. doi: 10.1016/j.matchar.2019.109846. ISSN 1044-5803.

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Official URL: https://doi.org/10.1016/j.matchar.2019.109846

Abstract

Differential thermal analyses of an AlSi6Cu4Fe2 alloy at various cooling rates from the liquid state were performed which showed: i) possible discrepancies in the first solidification steps and; ii) solidification ending with multiple peaks at low cooling rate. Metallographic observation of the samples gave hint for understanding the discrepancies while the presence of rounded multi-phase pools – or so-called rosettes - entrapped within dendrite arms explained the multiple peaks because they solidified independently of each other. The very fine eutectic microstructure in these rosettes was investigated by scanning electron microscopy which showed the precipitation of a four-phase eutectic. Focused ions beam milling was then used to investigate the topology of the distribution of the four phases. Electron backscattered diffraction analysis was carried out to investigate their local crystallographic orientations and transmission electron microscopy analysis was performed to identify the very fine crystalline structures. This eutectic appears as one of the very few regular fourphase eutectics reported in the literature.

Item URL in elib:https://elib.dlr.de/128835/
Document Type:Article
Title:Solidification sequence and four-phase eutectic in AlSi6Cu4Fe2 alloy
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Oquab, DjarCIRIMAT, Université de Toulouse, ENSIACET, BP 44362, 31030 Toulouse, Cedex 4, FranceUNSPECIFIED
Josse, ClaudieCentre de Microcaractérisation Raimond Castaing, Université de Toulouse, UPS – CNRS – INPT – INSA, UMS 3623, 3 rue Caroline Aigle, 31400 Toulouse, FranceUNSPECIFIED
Proietti, ArnaudCentre de Microcaractérisation Raimond Castaing, Université de Toulouse, UPS – CNRS – INPT – INSA, UMS 3623, 3 rue Caroline Aigle, 31400 Toulouse, FranceUNSPECIFIED
Pugliara, AlessandroCIRIMAT, Université de Toulouse, ENSIACET, BP 44362, 31030 Toulouse, Cedex 4, FranceUNSPECIFIED
Lacaze, JacquesCIRIMAT, Université de Toulouse, ENSIACET, BP 44362, 31030 Toulouse, Cedex 4, FranceUNSPECIFIED
Steinbach, Sonjasonja.steinbach (at) dlr.deUNSPECIFIED
Ferdian, DenisDept. of Metallurgy and Materials Engineering, Universitas Indonesia, Kampus Baru UI Depok, 16424, IndonesiaUNSPECIFIED
Viguier, BernardCIRIMAT, Université de Toulouse, ENSIACET, BP 44362, 31030 Toulouse, Cedex 4, FranceUNSPECIFIED
Date:2 August 2019
Journal or Publication Title:Materials Characterization
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:156
DOI :10.1016/j.matchar.2019.109846
Page Range:p. 109846
Editors:
EditorsEmailEditor's ORCID iD
Baker, I.UNSPECIFIEDUNSPECIFIED
Publisher:Elsevier
Series Name:Elsevier - International Metallographic Society
ISSN:1044-5803
Status:Published
Keywords:Four-phase eutectic, regular eutectic, rosette, Aluminium alloy
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 - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Steinbach, Dr.rer.nat. Sonja
Deposited On:26 Aug 2019 06:45
Last Modified:06 Sep 2019 15:18

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