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Microstructure evolution in undercooled Al–8 wt%Fe melts: Comparison between terrestrial and parabolic flight conditions

Chen, J. and Lengsdorf, Roman and Henein, Hani and Herlach, Dieter and Dahlborg, U. and Calvo-Dahlborg, M. (2013) Microstructure evolution in undercooled Al–8 wt%Fe melts: Comparison between terrestrial and parabolic flight conditions. Journal of Alloys and Compounds, 556, pp. 243-251. Elsevier. doi: 10.1016/j.jallcom.2012.11.182. ISSN 0925-8388.

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Al–8 wt%Fe, a hypereutectic alloy, was studied under electromagnetic levitation (EML) solidification conditions in both terrestrial and reduced gravity conditions. The latter was carried out on the A300 aircraft using the TEMPUS facility. The solidified samples were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction and neutron diffraction techniques. The results are interpreted in the light of the temperature–time measurements taken in situ during the solidification process in the EML. It is shown that both samples experienced some undercooling for the solidification of the primary Al–Fe intermetallic phase, which is likely AlmFe. The solidification path continues with the nucleation and growth of Al13Fe4 followed by primary a-Al. These last two phases do not seem to show any measureable undercooling and recalescence events. Finally, the metastable AlxFe (where x = 5) nucleates starting with the formation of eutectic. This metastable intermetallic continues the eutectic growth as Al13Fe4. The morphology differences of the intermetallics growing under terrestrial and reduced gravity conditions are clear with acicular morphology for the former and a star like morphology for the latter. The primary a-Al has a clear strong textured structure in the reduced gravity sample, while a weak one is observed in the terrestrially processed sample. The difference in texture is attributed to the weaker fluid flow occurring in the droplet under reduced gravity conditions while the difference in the morphology of the primary intermetallic is attributed to the higher cooling rate experienced by the reduced gravity sample compared to that for the terrestrially processed sample.

Item URL in elib:https://elib.dlr.de/81787/
Document Type:Article
Title:Microstructure evolution in undercooled Al–8 wt%Fe melts: Comparison between terrestrial and parabolic flight conditions
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Chen, J.University of Alberta, CanadaUNSPECIFIEDUNSPECIFIED
Dahlborg, U.University of Rouen, FranceUNSPECIFIEDUNSPECIFIED
Calvo-Dahlborg, M.University of Rouen, FranceUNSPECIFIEDUNSPECIFIED
Date:March 2013
Journal or Publication Title:Journal of Alloys and Compounds
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 243-251
Keywords:Undercooling of Materials
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 - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Herlach, Dieter
Deposited On:02 Apr 2013 11:38
Last Modified:14 Jun 2023 17:00

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