The hot working flow stress and microstructure in magnesium AZ31

Beer,AG and Barnett,MR 2014, The hot working flow stress and microstructure in magnesium AZ31. In Mathaudhu,S, Luo,A, Neelameggham,N, Nyberg,E and Sillekens,W (ed), Essential readings in magnesium technology, Wiley Blackwell, London, Eng., pp.369-374, doi: 10.1002/9781118859803.ch59.

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Title The hot working flow stress and microstructure in magnesium AZ31
Author(s) Beer,AG
Barnett,MRORCID iD for Barnett,MR
Title of book Essential readings in magnesium technology
Editor(s) Mathaudhu,S
Publication date 2014
Chapter number 59
Total chapters 99
Start page 369
End page 374
Total pages 6
Publisher Wiley Blackwell
Place of Publication London, Eng.
Keyword(s) Dynamic recrystallisation
Flow stress
Strain rates
Summary The evolution of flow stress and microstructure for wrought magnesium alloy AZ31 was characterised using torsion and compression testing. Temperatures ranging between 300°C and 450°C and strain rates between 0.001s-1 and 1s-1, were employed. Constitutive equations were developed for the flow stress at a strain of 1.0 for torsion, and 0.6 for compression. The flow stress was found to be strongly dependent on deformation mode at low strains. This can be explained in terms of the influence of the deformation accommodating processes of prismatic slip and dynamic recrystallisation (DRX). At higher strains, when the change in flow stress with strain is lower, the flow stress was relatively insensitive to deformation mode. Optical microscopy carried out on torsion samples quenched after twisting to strains between 0.2 and 2 revealed dynamically recrystallised (DRX) grains situated on pre-existing grain boundaries. The average grain size was reduced from 22.5μm down to 7.3 μm after a strain of 2, with the initial grain size being halved after a strain of 0.5.
ISBN 9781118858943
Language eng
DOI 10.1002/9781118859803.ch59
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861199 Basic Metal Products (incl. Smelting
HERDC Research category B1 Book chapter
ERA Research output type B Book chapter
Copyright notice ©2014, Wiley-Blackwell
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Document type: Book Chapter
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