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Cooling slope casting to obtain thixotropic feedstock

Cardoso Legoretta, E., Atkinson, H.V. and Jones, H. (2007) Cooling slope casting to obtain thixotropic feedstock. In: Jones, H., (ed.) SP07 Proceedings of the 5th Decennial International Conference on Solidification Processing. Department of Engineering Materials, University of Sheffield. , Sheffield , pp. 582-586. ISBN ISBN-13: 978-0-9522507-4-6

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Abstract

Thixoforming, and related semi-solid processing routes for metallic alloys, require feedstock with a non-dendritic microstructure in the semi-solid state. The material then behaves in a thixotropic way in that, when it is sheared it flows and can be forced to fill a die and, when it is allowed to stand it thickens again. The New Rheocasting (the NRC process) is a recently developed semi-solid processing route. There are two versions of this route. In one, molten alloy is poured directly into a tilted mould and, through careful temperature control during cooling, a spheroidal semi-solid microstructure is achieved. The material in the mould is then upended into a shot sleeve and hence forced into a die. Alternatively, the molten alloy is poured onto a cooling slope and thence into a mould before processing. The aim of the work described in this paper was to develop understanding of the microstructural development during the initial stages of this process. The results for pouring A356 aluminium alloy via a cooling slope into a mould are presented.

Item Type: Book Section
Copyright, Publisher and Additional Information: Copyright © 2007 Howard Jones on behalf of the named authors.
Keywords: cooling slope casting, thixotropic feedstock material, A356 Al alloy
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
Depositing User: Repository Officer
Date Deposited: 21 Aug 2007 17:12
Last Modified: 08 Feb 2013 16:54
Status: Published
Publisher: Department of Engineering Materials, University of Sheffield.
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/2642

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