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Anomalous dendrite growth in undercooled melts of Al-Ni alloys

Lengsdorf, Roman and Holland-Moritz, Dirk and Herlach, D.M. (2010) Anomalous dendrite growth in undercooled melts of Al-Ni alloys. DPG Spring Meeting 2010, 21.03.-26.03.2010, Regensburg, Deutschland.

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Abstract

We have measured dendrite growth velocities as a function of undercooling on liquid Al-Ni alloys using electromagnetic levitation on Earth and in reduced gravity. In total, six differently concentrated alloys are investigated, one of them for comparative investigations during the sounding rocket mission TEXUS 44. While on the Ni-rich side of Al-Ni alloys growth velocity is increasing with increasing undercooling, Al-rich Al-Ni alloys show an unusual decrease of the growth velocity with increasing undercooling in the terrestrial investigations. The comparison of the results of complementary terrestrial and microgravity experiments suggests that the anomalous growth behavior of Al-rich Al–Ni alloys may be caused by fluid-flow related processes during non-equilibrium solidification of undercooled melts. Support by ESA within contract number 15236/02/NL/SH (NEQUISOL) and by the European Commission EC under contract FP6-500635-2 (IMPRESS) is gratefully acknowledged.

Item URL in elib:https://elib.dlr.de/63827/
Document Type:Conference or Workshop Item (Speech)
Title:Anomalous dendrite growth in undercooled melts of Al-Ni alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lengsdorf, RomanRuhr-Universität BochumUNSPECIFIED
Holland-Moritz, Dirkdirk.holland-moritz (at) dlr.deUNSPECIFIED
Herlach, D.M.dieter.herlach (at) dlr.deUNSPECIFIED
Date:25 March 2010
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Undercooling, Dendrite Growth, Microgravity
Event Title:DPG Spring Meeting 2010
Event Location:Regensburg, Deutschland
Event Type:international Conference
Event Dates:21.03.-26.03.2010
Organizer:Deutsche Physikalische Gesellschaft
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Holland-Moritz, Dr.rer.nat. Dirk
Deposited On:07 Apr 2010 11:20
Last Modified:07 Apr 2010 11:20

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