Strain-dependent constitutive analysis of three wrought Mg–Al–Zn alloys

Journal article (2008)
Department
Materials Science and Engineering (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2008 Slooff, F.A.; Zhou, J.; Duszczyk, J.; Katgerman, L.
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Published Date

23-10-2008

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Source:

Journal of Materials Science, 43 (22)

Faculty

Mechanical, Maritime and Materials Engineering

Department

Materials Science and Engineering

Abstract

The commonly used hyperbolic sine constitutive equation for metal forming at elevated temperatures, with no strain incorporated, is in principle applicable only to deformation in the steady state. However, the actual deformation processes applied to magnesium alloys are mostly in the non-steady state. In the present research, the results of hot uniaxial compression tests of three wrought magnesium alloys covering wide ranges of temperatures and strain rates were used for a strain-dependent constitutive analysis. A strain-dependent constitutive relationship for these alloys was established. It appeared that the apparent activation energy for deformation decreased with increasing the alloying content in these alloys. The constitutive parameters obtained were used to predict flow stresses at given strains and the results were in good agreement with experimental measurements.

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