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Influence of Fe and Mn Content on 6xxx Extrusion Alloys

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Influence of Fe and Mn Content on 6xxx Extrusion Alloys

Malcolm J. Couper, ARC Centre of Excellence for Design in Light Metals,
Monash University, Melbourne, Australia;
Lisa D. Sweet, CAST Cooperative Research Centre, Monash University,
Melbourne, Australia; and
Xinquan Zhang, Asia-Pacific Sales & Marketing, Primary Metal,
Rio Tinto Alcan, Australia


Track: BILLET PROCESS & EQUIPMENT - Alloys

ABSTRACT—Iron (Fe) is a common addition to 6xxx alloys, forming AlFeSi intermetallics,
which typically transform and break up during homogenization, and have an impact on the
extrudability of alloys. With the addition of manganese (Mn), the occurrence and transformation
of intermetallics are altered. An approach has been developed to accelerate investigations relating
alloy composition and homogenization to microstructure. Experiments have been conducted to
determine the occurrence of intermetallics for a range of Fe and Mn contents in 6060/6063 alloys.
The types and amounts of intermetallics have been determined and compared with phase
calculations to allow a simple balance of alloying elements, useful for alloy design.

© Extrusion Technology for Aluminum Profiles Foundation (ET Foundation). All rights reserved. No part of The Proceedings may be reproduced in any form without the express written permission of the ET Foundation.

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