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Effect of fraction solid on coarsening of secondary dendrite arms

Ratke, Lorenz (2009) Effect of fraction solid on coarsening of secondary dendrite arms. International Journal of Cast Metals Research, 22 (1-4), pp. 268-270. Maney Publishing. DOI: 10.1179/136404609X367911 .

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Official URL: http://www.ingentaconnect.com/content/maney/ijcmr/2009/00000022/F0040001/art00066;jsessionid=12be9xxyrk7w3.alice

Abstract

Coarsening of secondary dendrite arms in mushy zones has been investigated theoretically and experimentally for many decades and simple phenomenological models have been developed describing the cube root dependence of the spacing on the solidification time. These models neglect in their description of mass transport between dendrite arms, that the finite volume fraction modifies the transport fluxes considerably. This paper describes an extension of conventional theoretical models for the secondary arm spacing based on finite volume fraction effect models for Ostwald ripening of spherical or cylindrical ensembles. The model predicts a much larger coarsening rate while the kinetics (cube root dependence) is conserved.

Document Type:Article
Title:Effect of fraction solid on coarsening of secondary dendrite arms
Authors:
AuthorsInstitution or Email of Authors
Ratke, LorenzUNSPECIFIED
Date:August 2009
Journal or Publication Title:International Journal of Cast Metals Research
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:22
DOI:10.1179/136404609X367911
Page Range:pp. 268-270
Publisher:Maney Publishing
Status:Published
Keywords:secondayr dendrite arms, fraction solid, coarsening, Ostwald ripening
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: Prof. Lorenz Ratke
Deposited On:20 Aug 2009 14:38
Last Modified:26 Feb 2013 15:03

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