File(s) under permanent embargo
The hot working flow stress and microstructure in magnesium AZ31
chapter
posted on 2014-01-01, 00:00 authored by Aiden BeerAiden Beer, Matthew BarnettMatthew BarnettThe 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
Title of book
Essential readings in magnesium technologyChapter number
59Pagination
369 - 374Publisher
Wiley BlackwellPlace of publication
London, Eng.Publisher DOI
ISBN-13
9781118858943Language
engPublication classification
B Book chapter; B1 Book chapterCopyright notice
2014, Wiley-BlackwellExtent
99Editor/Contributor(s)
S Mathaudhu, A Luo, N Neelameggham, E Nyberg, W SillekensUsage metrics
Categories
No categories selectedLicence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC