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Constitutive Equations for Hot Extrusion of AA6005A, AA6063, and AA7020 Alloys

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Constitutive Equations for Hot Extrusion of AA6005A, AA6063, and
AA7020 Alloys

Tommaso Pinter 1 and Mohamad El Mehtedi 2
1 Almax Mori S.r.l., Mori, Italy
2 Università Politecnica delle Marche, Ancona, Italy

Track: EXTRUSION/DIE THEORETICAL - Benchmark, Finite-Element Method, Metal Flow

ABSTRACT—Constitutive equations relate thermo-mechanical parameters, i.e., strain (ε),
strain rate , and temperature (T) with flow stress (σ). The most popular constitutive
relationship, among those used in the study of hot deformation, is the phenomenological sinh
Garofalo equation. In recent years, several papers have described the hot deformation of
aluminum alloys by mean of hot torsion testing. However, sinh constitutive parameters are
seldom available in the literature even for the commonest aluminum alloys used today by the
extrusion industry. This paper presents the result of torsion tests which provide parameters for
constitutive equations for AA6005A, AA6063, and AA7020 alloys. The relative
extrudabilities of these alloys were estimated by means of FEM simulation carried out by the
HyperXtrude® software.

© 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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