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High Temperature Materials and Processes

Editor-in-Chief: Fukuyama, Hiroyuki

Editorial Board: Waseda, Yoshio / Fecht, Hans-Jörg / Reddy, Ramana G. / Manna, Indranil / Nakajima, Hideo / Nakamura, Takashi / Okabe, Toru / Ostrovski, Oleg / Pericleous, Koulis / Seetharaman, Seshadri / Straumal, Boris / Suzuki, Shigeru / Tanaka, Toshihiro / Terzieff, Peter / Uda, Satoshi / Urban, Knut / Baron, Michel / Besterci, Michael / Byakova, Alexandra V. / Gao, Wei / Glaeser, Andreas / Gzesik, Z. / Hosson, Jeff / Masanori, Iwase / Jacob, Kallarackel Thomas / Kipouros, Georges / Kuznezov, Fedor


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Open Access
Online
ISSN
2191-0324
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Volume 30, Issue 1-2

Issues

Complex Flow Stress Model for a Magnesium Alloy AZ31 at Hot Forming

Miroslav Legerski
  • Corresponding author
  • VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
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/ Jiří Plura
  • VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
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/ Ivo Schindler
  • VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
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/ Stanislav Rusz
  • VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
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/ Petr Kawulok
  • VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
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/ Hana Kulveitová
  • VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
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/ Eugeniusz Hadasik / Dariusz Kuc / Grzegorz Niewielski
Published Online: 2011-04-19 | DOI: https://doi.org/10.1515/htmp.2011.008

Abstract

Compression tests of magnesium alloy Mg-3Al-1Zn (AZ31) at different temperatures and strain rate were made on plastometer Gleeble 3800. Deformation behaviour and particularly shape of stress-strain curves of the alloy AZ31 differ significantly at low and high values of Zener–Hollomon parameter Z. The border between these areas was determined mathematically as Z = 2.9E+13 s–1. While the calculated activation energy Q was for both these areas practically identical (157 or 155 kJ mol–1), mathematical description of coordinates of the peak stress differs considerably. Regression and statistical analysis of experimental data have confirmed unequivocally, that it was impossible to describe by a uniform equation the whole set of data (i.e. traditional stress-strain curves, as well as those with atypical initial stage, given by the massive twinning). That's why two mathematical models were developed enabling prediction of the flow stress of investigated magnesium alloy in dependence on temperature, strain and strain rate, with inclusion of the influence of dynamic recrystallisation.

Keywords.: magnesium alloy AZ31; stress-strain curves; activation energy; hot flow stress model

About the article

Corresponding author: Miroslav Legerski, VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic


Received: 2010-07-30

Accepted: 2010-09-02

Published Online: 2011-04-19

Published in Print: 2011-04-01


Citation Information: High Temperature Materials and Processes, Volume 30, Issue 1-2, Pages 63–69, ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: https://doi.org/10.1515/htmp.2011.008.

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