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Dendritic growth kinetics of undercooled Fe-B alloy melts

Karrasch, Christian and Volkmann, Thomas and Herlach, Dieter M. (2014) Dendritic growth kinetics of undercooled Fe-B alloy melts. Frühjahrstagung Sektion Kondensierte Materie der DPG, 30.03.-04.04.2014, Dresden, Deutschland.

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Abstract

In metallic alloys dendritic growth is the major crystal growth mode controlling the evolution of the microstructure during solidi�cation. The present work investigates the growth kinetics on pure Fe and Fe- B alloy melts in order to verify models for dendritic growth in undercooled melts. In detail, we analyze the e�ect of solute redistribution and solute trapping on the rapid growth of dilute Fe-1 at.% B alloy with B showing a small partitioning coe�cient. For in-situ studies on deeply undercooled melts electromagnetic levitation technique (EML) is used. The rapid solidi�cation is recorded by a high-speed camera. Undercoolings from 50 K to 300 K prior to solidi�cation leads to growth velocities of several cm/s up to m/s. Concerning terrestrial EML the electromagnetic �eld necessary for levitation induces strong convective uid ow inside the melt. To investigate the e�ect of convection on the growth kinetics experiments on parabolic ight are carried out under reduced gravity conditions. The microstructure of the solidi�ed sample is analyzed by SEM and EBSD. Experimental results will be presented and discussed in the frame of current models for dendritic growth in undercooled melts. This research work is supported by DFG contract HE1601/18 and by ESA under contract 4200020277 and 4200014980.

Item URL in elib:https://elib.dlr.de/90117/
Document Type:Conference or Workshop Item (Speech)
Title:Dendritic growth kinetics of undercooled Fe-B alloy melts
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Karrasch, Christianchristian.karrasch (at) dlr.deUNSPECIFIED
Volkmann, Thomasthomas.volkmann (at) dlr.deUNSPECIFIED
Herlach, Dieter M.dieter.herlach (at) dlr.deUNSPECIFIED
Date:31 March 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:bent dendrite, undercooling, solidification, Electromagnetic Levitation, ISS, TEMPUS, Parabolic Flight
Event Title:Frühjahrstagung Sektion Kondensierte Materie der DPG
Event Location:Dresden, Deutschland
Event Type:national Conference
Event Dates:30.03.-04.04.2014
Organizer:DPG
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 > Scientific Experiments MP
Deposited By: Gegner, Jan
Deposited On:07 Aug 2014 10:16
Last Modified:07 Aug 2014 10:16

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