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Evolution of specific surface area with solid fraction during solidification

Ratke, Lorenz and Genau, Amber (2010) Evolution of specific surface area with solid fraction during solidification. Acta Materialia, 58 (12), pp. 4207-4211. Elsevier. DOI: doi:10.1016/j.actamat.2010.04.012.

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Official URL: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TW8-5022MGS-2&_user=100058&_coverDate=07%2F31%2F2010&_rdoc=15&_fmt=high&_orig=browse&_srch=doc-info%28%23toc%235556%232010%23999419987%232094744%23FLA%23display%23Volume%29&_cdi=5556&_sort=d&_doca

Abstract

The specific surface area varies with solid fraction during phase transformation from liquid to solid. The few measurements available show a non-linear dependence of the specific surface area on the solid fraction, with an initial increase as the amount of solid increases, followed by a decrease as the system moves toward complete transformation. We derive a simple model for this behaviour assuming a combination of growth and coalescence. We obtain a relation exhibiting an increase with the square root of fraction solid at low volume fractions, independent of a growth law, and a decrease at higher volume fractions which depends on the model chosen to describe the coalescence of dendrites. By choosing an appropriate constant, the model accurately describes recent data presented by Limodin and coworkers.

Document Type:Article
Title:Evolution of specific surface area with solid fraction during solidification
Authors:
AuthorsInstitution or Email of Authors
Ratke, Lorenzlorenz.ratke@dlr.de
Genau, AmberUNSPECIFIED
Date:May 2010
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:58
DOI:doi:10.1016/j.actamat.2010.04.012
Page Range:pp. 4207-4211
Publisher:Elsevier
Status:Published
Keywords:Fraction solid; Specific surface area; Growth; Coalescence
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:21 Jun 2010 09:23
Last Modified:07 Feb 2013 20:59

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