The deformation, recrystallisation and texture of three magn(3)

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Mackenzieetal.Thedeformation,recrystallisationandtextureofthreemagnesiumalloyextrusions

2EBSDimageshowingmicrostructureofAZ31following

extrusionat282uC:smallgrainscircledareassociated

withhighdensityof

LABs

TheEBSDorientationmicrographinFig.2showsthe

microstructureofAZ31followingextrusionat282uC.

Thelargegraininthecentreofthemicrographisnot

equiaxed;itstretchesfromthetoptothebottomofthe

image.Thesmallrecrystallisedgrainscircledinthe

centreofthemicrographareadjacenttoahighdensity

ofLABsintheunrecrystallisedregion.

ThemicrostructureofZC71followingextrusionat

270uCisshownintheEBSDorientationmicrograph

3EBSDimageshowingmicrostructureofZC71following

extrusionat270uC:smallrecrystallisedgrainsringed

intoprightofimageareassociatedwithHABs;sub-

grainswithinunrecrystallisedgrainareringedinbot-

tomleftof

image4EBSDimageshowingmicrostructureofWE43follow-ingextrusionat360uC:deformationheterogeneitiesareindicatedbyarrows;smallrecrystallisedgrainsringedareassociatedwith

heterogeneitiespresentedinFig.3.ThelargeunrecrystallisedgrainscontainLABsandsubgrains,whicharecircledinthebottomleftoftheimage.ExamplesofLABsthatdissecttheunrecrystallisedgrainsareindicatedbyarrows.Inthetoprightofthemicrographsmallrecrystallisedgrainsareringed;theseareassociatedanHAB.ThemicrostructureofWE43followingextrusionat360uCisshownintheEBSDorientationmicrographspresentedinFigs.4and5.InFig.4,HABsthatcrosstheunrecrystallisedregionareindicatedwitharrows;thesmallgrainsringedareassociatedwiththeHABs.InFig.5,smallgrainsareassociatedwiththesecondphaseparticlesinthecentreofthemicrograph.AnnealedmicrostructuresDuringannealingfor24hat435uCthemicrostructuresofAZ31andZC71fullyrecrystallised;theMLIgrainsizesintheannealedalloyswere25and55mmrespectively.Duringannealingfor24hat525uC

the5EBSDimageshowingmicrostructureofWE43follow-ingextrusionat360uC:mostofsmallrecrystallisedgrainsareassociatedwithsecondphaseparticles

MaterialsScienceandTechnology2007VOL23NO101175

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