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Microstructural Gradients Near the Surface of Large 6xxx Aluminum Extrudates

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Microstructural Gradients Near the Surface of Large 6xxx Aluminum Extrudates Due to Localized Deformation

Steven R. Claves and Wojciech Z. Misiolek, Institute for Metal Forming, Lehigh University

Track: EXTRUSION PROCESS - Peripheral Coarse Grain

ABSTRACT --- Heterogeneous deformation is present in most metal forming processes,
especially those which involve high amounts of plastic strain, such as extrusion. This
strain localization is responsible for the formation of microstructural gradients, which may
be extreme, especially in the case of large extrusion profiles. Grains within the localized
zone may be distinctively different from other regions of the profile. These variations are
further complicated by recrystallization kinetics and complex quenching processes. This
research describes the material reaction to the processing conditions, and how the
resulting microstructure influences the final extrudate properties. For these experiments,
a large, vertically symmetric, 6105 aluminum extrudate was examined to investigate the
microstructural properties that exist as a function of position relative to the surface. The
grains display gradients in size, shape, hardness, and orientation. These characteristics
were measured by light optical microscopy (LOM), microhardness (M-H), and electron
backscatter diffraction (EBSD). In addition, a basic model is proposed to describe the
complex interaction between deformation, recrystallization, and quenching in order to
explain the microstructural results.

© 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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