Mullis, AM orcid.org/0000-0002-5215-9959, Jegede, OE, Bigg, TD et al. (1 more author) (2020) Dynamics of core–shell particle formation in drop-tube processed metastable monotectic alloys. Acta Materialia, 188. pp. 591-598. ISSN 1359-6454
Abstract
We examine the apparent size of the core and shell as a function of cooling rate in core–shell particles of the metastable monotectic alloy Co-50 at% Cu, finding that the volume fraction of the core systematically increases with cooling rate and hence undercooling. A model for this variation is proposed. A Monte-Carlo simulation is used to correct for sectioning effects allowing the true core:shell volume ratio to be estimated. From this, and the observation of a second, spinodal, episode of liquid phase separation we are able to estimate the undercooling at solidification. This permits a calculation of the time available following liquid phase separation for the migration giving rise to the observed core–shell structure to occur and hence the required Marangoni velocity required to such migration.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. This is an author produced version of an article published in Acta Materialia. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Monotectic solidification; Rapid solidification; Undercooling; Liquid phase separation |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 07 May 2020 14:27 |
Last Modified: | 18 Feb 2021 01:38 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.actamat.2020.02.017 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:160357 |