Microstructural and constitutive analysis in process modeling of hot working: The case of a Mg-Zn-Mn alloy
This study presents an analysis of the microstructural evolution and flow stress variation with strain of a Mg-2%Zn-1%Mn alloy during hot deformation, carried out through a combination of torsion experiments, electron backscatter diffraction (EBSD) studies and constitutive analysis. Straining was ob...
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Published in | Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 661; pp. 40 - 50 |
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Format | Journal Article |
Language | English |
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Elsevier B.V
20.04.2016
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Abstract | This study presents an analysis of the microstructural evolution and flow stress variation with strain of a Mg-2%Zn-1%Mn alloy during hot deformation, carried out through a combination of torsion experiments, electron backscatter diffraction (EBSD) studies and constitutive analysis. Straining was observed to produce dynamic recrystallization (DRX). It emerged that such DRX was sluggish at 250°C, while almost complete grain refinement occurred at 350°C. A further increase in temperature led to concurrent grain growth and dynamic recrystallization, resulting in coarse grain size. A modified strain-dependent form of the Garofalo equation was used in the constitutive analysis, obtaining a more than satisfactory description of the experimental results. The extrapolation of the model in the low strain rate/high strain regions led to an equally satisfactory description of the experimental data. The analysis of the variation of the activation energy for hot working, which was equivalent to the activation energy for self-diffusion, suggested that deformation was recovery-controlled in most of the range of the experimental conditions investigated. |
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AbstractList | This study presents an analysis of the microstructural evolution and flow stress variation with strain of a Mg-2%Zn-1%Mn alloy during hot deformation, carried out through a combination of torsion experiments, electron backscatter diffraction (EBSD) studies and constitutive analysis. Straining was observed to produce dynamic recrystallization (DRX). It emerged that such DRX was sluggish at 250°C, while almost complete grain refinement occurred at 350°C. A further increase in temperature led to concurrent grain growth and dynamic recrystallization, resulting in coarse grain size. A modified strain-dependent form of the Garofalo equation was used in the constitutive analysis, obtaining a more than satisfactory description of the experimental results. The extrapolation of the model in the low strain rate/high strain regions led to an equally satisfactory description of the experimental data. The analysis of the variation of the activation energy for hot working, which was equivalent to the activation energy for self-diffusion, suggested that deformation was recovery-controlled in most of the range of the experimental conditions investigated. This study presents an analysis of the microstructural evolution and flow stress variation with strain of a Mg-2%Zn-1%Mn alloy during hot deformation, carried out through a combination of torsion experiments, electron backscatter diffraction (EBSD) studies and constitutive analysis. Straining was observed to produce dynamic recrystallization (DRX). It emerged that such DRX was sluggish at 250 degree C, while almost complete grain refinement occurred at 350 degree C. A further increase in temperature led to concurrent grain growth and dynamic recrystallization, resulting in coarse grain size. A modified strain-dependent form of the Garofalo equation was used in the constitutive analysis, obtaining a more than satisfactory description of the experimental results. The extrapolation of the model in the low strain rate/high strain regions led to an equally satisfactory description of the experimental data. The analysis of the variation of the activation energy for hot working, which was equivalent to the activation energy for self-diffusion, suggested that deformation was recovery-controlled in most of the range of the experimental conditions investigated. |
Author | Jäger, A. El Mehtedi, M. Gärtnerová, V. Spigarelli, S. |
Author_xml | – sequence: 1 givenname: S. surname: Spigarelli fullname: Spigarelli, S. email: s.spigarelli@univpm.it organization: DIISM, Università Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy – sequence: 2 givenname: A. surname: Jäger fullname: Jäger, A. organization: Laboratory of Nanostructures and Nanomaterials, Institute of Physics AS CR, Na Slovance 2, Prague 182 21, Czech Republic – sequence: 3 givenname: M. surname: El Mehtedi fullname: El Mehtedi, M. organization: DIISM, Università Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy – sequence: 4 givenname: V. surname: Gärtnerová fullname: Gärtnerová, V. organization: Laboratory of Nanostructures and Nanomaterials, Institute of Physics AS CR, Na Slovance 2, Prague 182 21, Czech Republic |
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Snippet | This study presents an analysis of the microstructural evolution and flow stress variation with strain of a Mg-2%Zn-1%Mn alloy during hot deformation, carried... |
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SubjectTerms | Activation energy Dynamic recrystallization EBSD Electron back scatter diffraction Hot working Magnesium alloys Magnesium base alloys Mathematical models Mechanical characterization Microstructure Plasticity Strain |
Title | Microstructural and constitutive analysis in process modeling of hot working: The case of a Mg-Zn-Mn alloy |
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