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.
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