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Understanding the formation of twinned dendrites (‘feather’ grains)

Mullis, A.M. (2007) Understanding the formation of twinned dendrites (‘feather’ grains). In: SP07 Proceedings of the 5th Decennial International Conference on Solidification Processing. Department of Engineering Materials, University of Sheffield. , Sheffield , pp. 126-129. ISBN ISBN-13: 978-0-9522507-4-6

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Abstract

The phenomenon of feather grain growth is interesting from both a theoretical and commercial point of view. Here we report the results of phase-field simulations aimed at understanding the formation of twinned dendrites. We show that, while a competition between oppositely directed capillary and kinetic anisotropies with a simple four-fold symmetry can produce low anisotropy structures such as dendritic seaweed, there is no indication that this can give rise to twinned dendrites. In contrast, adding small components of an anisotropy, with higher order harmonics, can produce features reminiscent of twinned dendrites and may also be able to stabilise the grooved tip morphology.

Item Type: Book Section
Copyright, Publisher and Additional Information: Copyright © 2007 Howard Jones on behalf of the named authors.
Keywords: twinned dendritic growth, feather growth
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Process, Environmental and Materials Engineering (Leeds) > Institute for Materials Research (Leeds)
Depositing User: Repository Officer
Date Deposited: 21 Aug 2007 17:10
Last Modified: 08 Feb 2013 17:04
Status: Published
Publisher: Department of Engineering Materials, University of Sheffield.
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/2640

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