On the rheocasting of high integrity hollow shape components for automotive applications using 357 aluminum alloy

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DOIResolve DOI: http://doi.org/10.4028/www.scientific.net/SSP.192-193.539
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TypeArticle
Proceedings titleSolid State Phenomena
Conference12th International Conference on Semi-Solid Processing of Alloys and Composites, October 8-11 2012, Cape Town, South Africa
ISSN1662-9779
Volume192-193
Pages539544
Subject357 aluminum alloy; Hollow shape; Rheocasting; SEED; Semi-solid
AbstractRecent studies regarding semi-solid casting as a viable alternative to conventional liquid metal casting have been met with considerable interest. The dual nature of semi-solid materials results in a marked decrease in internal defects otherwise associated with conventional casting methods. In recent years, the National Research Council Canada - Aluminum Technology Centre (NRC-ATC) has dedicated itself to better understanding the behaviour of semi-solid aluminum alloys, notably 357, using the SEED (Swirled Enthalpy Equilibration Device) rheocasting method. SEED is a novel process which relies on the mechanical agitation and cooling of molten aluminum to produce a semi-solid billet. This billet is then injected into a die to yield the desired cast shape. The current work focuses on the rheocasting of a 357 aluminum alloy support bracket, consisting of four rings. Material flow around a ring is known to result in a welding of the two metal fronts. Traces of porosity and oxides can sometimes be found at the weld, unless preventative measures are taken. These include the use of overflows attached to the ring via a web as well as a careful control of the casting parameters. At NRC-ATC, several parts were rheocast and then subjected to both destructive and non-destructive testing, in an effort to better understand the material flow behaviour around these rings. The results obtained are presented herein.
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PublisherTrans Tech Publications Ltd.
LanguageEnglish
AffiliationAutomotive and Surface Transportation; National Research Council Canada
Peer reviewedYes
NPARC number23000579
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Record identifierf3294238-cfa5-4de9-bfd1-55aa8fd972bb
Record created2016-08-03
Record modified2016-08-03
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