Hot Tear Susceptibility of Al-Mg-Si Alloys with Varying Iron Contents

Hot tear susceptibility in a cast 0.53Si-0.33Mg-xFe 6060 aluminum alloy was investigated using the CAST Hot Tear rig, designed to simulate hot tearing in DC casting. The rig has two cast bars, one that is used to measure the load response and one which is fixed at both ends to restrain thermal contr...

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Bibliographic Details
Published in:AIP conference proceedings 2012-03
Main Authors: Sweet, Lisa, Easton, Mark, Taylor, John, Davidson, Cameron, Lu, Liming, Couper, Malcolm, StJohn, David
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Direct chill casting
Ferrous alloys
Iron
Iron and steel industry
Ratings
Tearing
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Summary:Hot tear susceptibility in a cast 0.53Si-0.33Mg-xFe 6060 aluminum alloy was investigated using the CAST Hot Tear rig, designed to simulate hot tearing in DC casting. The rig has two cast bars, one that is used to measure the load response and one which is fixed at both ends to restrain thermal contraction so that hot tearing could be observed if it occurred. The iron (Fe) content, ranging from 0.02-0.5wt pct, was seen to have a major influence on the load response during solidification and the crack rating of these alloys. The findings are discussed in terms of the coherencycoalescence model and are related to the influence of Fe content on the morphology, prevalence and precipitation sequence of the beta -Al5FeSi and 945-AlFeSi Fe-containing intermetallic phases. Observations made of hot tear fracture surfaces show that these phases may play distinctively different roles within the mechanism of hot tearing in these alloys.
ISSN:0094-243X