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Effect of solidification conditions on fractal dimension of dendrites

Genau, Amber L and Freedman, Alex and Ratke, Lorenz (2012) Effect of solidification conditions on fractal dimension of dendrites. Journal of Crystal Growth. Elsevier. doi: 10.1016/j.jcrysgro.2012.09.044.

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Official URL: http://www.sciencedirect.com/science/article/pii/S0022024812006902?v=s5


Dendrites are complex, three-dimensional structures that have conventionally been characterized by measuring the secondary dendrite arm spacing or the primary spacing in a dendritic network, but these global measures do not adequately describe the branched appearance of secondary and tertiary arms. This work focuses on the integral measurement of fractal dimension, a measure of complexity relatively unexplored in dendrites, in addition to specific surface area. Measurements were made on aluminum dendrites in directionally solidified Al–Si alloys of varying composition and solidification velocity, with and without induced convection currents. Contrary to expectations, average fractal dimension was found to be relatively insensitive to changes in solidification velocity and fluid flow within the ranges observed, compared to the variation in fractal dimension measured within any individual data set. Specific surface area was found to increase linearly with solidification velocity.

Item URL in elib:https://elib.dlr.de/77917/
Document Type:Article
Title:Effect of solidification conditions on fractal dimension of dendrites
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Genau, Amber LUniversity of Alabama, USAUNSPECIFIEDUNSPECIFIED
Freedman, AlexUniversity of AlabamaUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Journal of Crystal Growth
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Solidification; Dendrites;Fluid flows;Coarsening; Characterization
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: Ratke, Prof. Lorenz
Deposited On:16 Oct 2012 10:32
Last Modified:26 Mar 2013 13:42

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