Strain-dependent constitutive analysis of three wrought Mg–Al–Zn alloys |
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Authors: | F A Slooff J Zhou J Duszczyk L Katgerman |
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Affiliation: | (1) Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands |
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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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