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Dendrite growth in undercooled Al-rich Al-Ni melts measured on Earth and in Space

Herlach, Dieter and Burggraf, Stefan and Reinartz, Marcus and Galenko, P. and Rettenmayr, M. and Gandin, C.-A. and Henein, H. and Mullis, A. and Ilbagi, Arash and Valloton, Jonas (2019) Dendrite growth in undercooled Al-rich Al-Ni melts measured on Earth and in Space. Physical Review Materials, 073402 (3). American Physical Society. ISSN 2475-9953.

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The dendrite growth velocity in Al75Ni25 melts has been measured in a containerless procedure as a function of undercooling using an electromagnetic levitation technique both in the Earth laboratory and in Space on board the International Space Station. The growth shows an anomalous behavior inasmuch as the growth velocity decreases with increasing undercooling, confirming previous experiments on Earth. Within the scatter of experimental data, results obtained on Earth and in Space do not show significant differences. Thus, convection effects as the origin of the anomalous growth characteristics can be excluded. However, high-speed video recording exhibits multiple nucleation events in front of the growing solid-liquid interface. This effect is identified as the origin of the anomalous dendrite growth characteristics in undercooled melts of Al-rich Al-Ni melts.

Item URL in elib:https://elib.dlr.de/128485/
Document Type:Article
Title:Dendrite growth in undercooled Al-rich Al-Ni melts measured on Earth and in Space
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Herlach, DieterDieter.Herlach (at) dlr.deUNSPECIFIED
Reinartz, MarcusMarcus.Reinartz (at) dlr.deUNSPECIFIED
Rettenmayr, M.Otto Schott Institut für metallische Werkstoffe, Universität JenaUNSPECIFIED
Gandin, C.-A.Ecole de Mines de Paris, Sophia Antipolis, FranceUNSPECIFIED
Mullis, A.University of Leeds, UKUNSPECIFIED
Ilbagi, ArashUniversity of Alberta, CanadaUNSPECIFIED
Valloton, Jonasjonas.valloton (at) dlr.deUNSPECIFIED
Date:July 2019
Journal or Publication Title:Physical Review Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:American Physical Society
Keywords:Dendrite growth in undercooled Al-rich Al-Ni melts measured on Earth and in Space
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: Prochnow, Kim
Deposited On:22 Jul 2019 09:49
Last Modified:15 Jan 2020 15:24

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