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Evidence of the transition from ordered to disordered growth during rapid solidification of an intermetallic phase

Hartmann, Helena and Holland-Moritz, Dirk and Galenko, Peter and Herlach, Dieter M. (2009) Evidence of the transition from ordered to disordered growth during rapid solidification of an intermetallic phase. Europhysics Letters (87), p. 40007.

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Abstract

The dendrite growth velocity during solidification is measured on liquid drops of the intermetallic compound Ni50Al50 undercooled by levitation up to 265K. A sharp increase of the growth velocity is found at a critical undercooling ∆T*=250K. In situ diffraction of synchrotron radiation on levitation-processed samples unambiguously shows a transition from ordered to disordered growth at ∆T. The sharp interface model is extended to describe the transition from ordered to disordered dendrite growth by taking into account the velocity dependence of the order parameter and the kinetic growth coefficient.

Document Type:Article
Title:Evidence of the transition from ordered to disordered growth during rapid solidification of an intermetallic phase
Authors:
AuthorsInstitution or Email of Authors
Hartmann, HelenaUNSPECIFIED
Holland-Moritz, DirkUNSPECIFIED
Galenko, PeterUNSPECIFIED
Herlach, Dieter M.dieter.herlach@dlr.de
Date:2009
Journal or Publication Title:Europhysics Letters
Refereed publication:No
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Page Range:p. 40007
Status:Published
Keywords:Solidification, intermetallic phase
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 Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Ingeborg Parpart
Deposited On:25 Nov 2009 10:13
Last Modified:26 Mar 2013 13:13

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