Mechanical Property Behaviour of Rheocast 319 Alloys with and without Iron Additions

Samuel, E. Isaac; Garat, Michel; Major, Fred

doi:10.4271/2011-01-1089

Cited by 2 publications

(1 citation statement)

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“…NRC-ATC has been involved with SEED rheocasting for the better part of a decade, having successfully obtained high integrity Al-Si castings, demonstrating very favorable levels of mechanical properties [6][7][8]. The present work serves to illustrate an offshoot study carried out on the mechanical performance of SEED-rheocast 357 alloy support bracket arms.…”

Section: Introductionmentioning

confidence: 92%

On the Rheocasting of High Integrity Hollow Shape Components for Automotive Applications Using 357 Aluminum Alloy

Samuel

Zheng

Côté

2012

SSP

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Recent 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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Section: Introductionmentioning

confidence: 92%