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Measurement of dendrite growth velocity as a function of undercooling on Al68.5Ni31.5 alloy in reduced gravity

Klein, Stefan and Herlach, Dieter M. and Kolbe, Matthias (2013) Measurement of dendrite growth velocity as a function of undercooling on Al68.5Ni31.5 alloy in reduced gravity. 142nd Annual Meeting & Exhibition, 03. - 07. March 2013, San Antonio, USA. (Unpublished)

Full text not available from this repository.

Abstract

Dendrite growth velocities are measured as a function of undercooling on Al–Ni alloys utilizing electromagnetic levitation. Various compositions were investigated. Whereas on the Ni-rich side, growth velocity increases with increasing undercooling, Al-rich alloys show an unusual decrease in growth velocity with increasing undercooling. Experiments on Al68.5Ni31.5 in reduced gravity (sounding rocket TEXUS 44) suggest that this anomalous behavior is caused by forced convection and is absent in µg. During the recent TEXUS 49 mission additional measurements of the dendrite growth velocity on the same alloy were performed and evaluated. In addition detailed post-mortem microstructure analyses have been performed to try to understand the growth mechanism of the Raney Al68.5Ni31.5 alloy. So far the unusual behavior of the dendrite growth velocity in undercooled melts of Al-rich Al-Ni alloys is not understood. Nevertheless the microgravity experiments helped to construct a hypothesis to explain the solidification mechanism of Al68.5Ni31.5

Item URL in elib:https://elib.dlr.de/81735/
Document Type:Conference or Workshop Item (Speech)
Title:Measurement of dendrite growth velocity as a function of undercooling on Al68.5Ni31.5 alloy in reduced gravity
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Klein, Stefanstefan.klein (at) dlr.deUNSPECIFIED
Herlach, Dieter M.dieter.herlach (at) dlr.deUNSPECIFIED
Kolbe, Matthiasmatthias.kolbe (at) dlr.deUNSPECIFIED
Date:4 March 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:Undercooling of Materials
Event Title:142nd Annual Meeting & Exhibition
Event Location:San Antonio, USA
Event Type:international Conference
Event Dates:03. - 07. March 2013
Organizer:TMS
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 - Forschung unter Weltraumbedingungen
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:26 Mar 2013 10:34
Last Modified:26 Mar 2013 10:34

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