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Solidification of tetragonal Ni2B from the undercooled melt

Binder, Sven and Kolbe, Matthias and Klein, Stefan and Herlach, Dieter (2012) Solidification of tetragonal Ni2B from the undercooled melt. Europhysics Letters, 97, p. 36003. EPLA. doi: 10.1209/0295-5075/97/36003.

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The dendrite growth velocity during non-equilibrium solidification of tetragonal Ni2B crystals is measured as a function of undercooling on electrostatically levitated droplets. Highspeed video imaging is applied to measure in situ the propagation of the solid-liquid interface apparent on the sample surface. To analyze the raw data, a three-dimensional model is developed to determine the growth velocity within the volume of the melt. Microstructure analysis is performed to resolve the pattern formation mechanism of tetragonal Ni2B crystals which differs significantly from the cubic case. The dendrite tips are found to grow perpendicular to the crystallographic {111} planes. As a consequence, the propagation of the solidification front on a macroscopic scale is determined by the lattice parameters of the tetragonal crystal structure. The dendrite growth velocities along the {111} normal directions are analyzed on a mesoscopic scale within a sharpinterface model.

Item URL in elib:https://elib.dlr.de/75315/
Document Type:Article
Title:Solidification of tetragonal Ni2B from the undercooled melt
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Binder, Svensven.binder (at) dlr.deUNSPECIFIED
Kolbe, Matthiasmatthias.kolbe (at) dlr.deUNSPECIFIED
Klein, Stefanstefan.klein (at) dlr.deUNSPECIFIED
Herlach, Dieterdieter.herlach (at) dlr.deUNSPECIFIED
Date:3 February 2012
Journal or Publication Title:Europhysics Letters
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:p. 36003
Keywords:Unterkühlung von Materialien
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 Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Herlach, Dieter
Deposited On:26 Mar 2012 15:02
Last Modified:10 Jan 2019 15:47

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