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

Author:

Pinter Tommaso1,El Mehtedi Mohamad2ORCID

Affiliation:

1. Almax Mori S.R.L

2. Università Politecnica delle Marche

Abstract

Constitutive equations relate thermo-mechanical parameters, i.e. strain (ε), strain rate (έ) 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 described the hot deformation of aluminum alloys by mean of hot torsion testing. However, sinh constitutive parameters are seldomly available in literature even for the commonest aluminum alloys used today by the extrusion industry. This paper presents the result of the torsion tests providing 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.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

Reference9 articles.

1. Sheppard T., Prediction of structure during shaped extrusion and subsequent static recrystallisation during the solution soaking operation, 2006, Journal of Materials Processing Technology, vol. 177, 26–35.

2. Bandar, A. R., Claves, S. R., Lu, J., Matous, K., Misiolek, W. Z., Maniatty, A. M., Microstructural Evaluation of 6xxx Aluminum Alloys for Computer-Simulated Texture Prediction, 2004, Aluminum Extrusion Technology Seminar ET 2004, Orlando, vol 1, 169-176.

3. El Mehtedi, M., Donati, L., Spigarelli, S., Tomesani, L., Analisi dell'evoluzione microstrutturale durante il processo di estrusione della lega AA6060 mediate simulazioni FEM, La Metallurgia Italiana, 6, 2009, 33-39.

4. Garofalo F., An empirical relation defining the stress dependence of minimum creep rate in metals, 1963, Transactions of the Metallurgical Society of Aime, Vol. 227, April, 351-356.

5. Verlinden B., Voith K., Constitutive Equations for Hot Deformation of Al-Mg-Si Alloys, Risø International Symposium on Materials Science: Numerical Predictions of Deformation Processes and the Behaviour of real Materials. Edited by Risø National Laboratory, Roskilde, Denmark, (1994).

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