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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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.
|Title:||Evidence of the transition from ordered to disordered growth during rapid solidification of an intermetallic phase|
|Journal or Publication Title:||Europhysics Letters|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||p. 40007|
|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)|
|Institutes and Institutions:||Institute of Materials Physics in Space|
|Deposited By:||Ingeborg Parpart|
|Deposited On:||25 Nov 2009 09:13|
|Last Modified:||26 Mar 2013 12:13|
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