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The hot working flow stress and microstructure in magnesium AZ31

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posted on 2014-01-01, 00:00 authored by Aiden BeerAiden Beer, Matthew BarnettMatthew Barnett
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.

History

Chapter number

59

Pagination

369-374

ISBN-13

9781118858943

Language

eng

Publication classification

B Book chapter, B1 Book chapter

Copyright notice

2014, Wiley-Blackwell

Extent

99

Editor/Contributor(s)

Mathaudhu S, Luo A, Neelameggham N, Nyberg E, Sillekens W

Publisher

Wiley Blackwell

Place of publication

London, Eng.

Title of book

Essential readings in magnesium technology

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