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Effects of Extrusion Parameters on Coarse Grain Surface Layer in 6xxx Series

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Effects of Extrusion Parameters on Coarse Grain Surface Layer in 6xxx Series Extrusions

Elizabeth D. Sweet, Sally K. Caraher, Natalia V. Danilova, Xinquan Zhang, Comalco Aluminium Limited

Track: EXTRUSION PROCESS - Peripheral Coarse Grain

ABSTRACT --- A layer of coarse grains on, or just under, the surface of an extrusion
can cause problems such as bending failure, orange peel finish, streaking and
variations in surface brightness. A series of extrusion trials were conducted to
determine the effects of various extrusion parameters on coarse-grain surface layer
formation in medium-to-high strength 6xxx series alloys. The study explores the
alternative approaches to the control of the coarse-grain surface layer through either
retarding recrystallization or promoting a fully recrystallized, fine grain structure.

© 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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