The deformation, recrystallisation and texture of three magn(5)

Mackenzieetal.Thedeformation,recrystallisationandtextureofthreemagnesiumalloyextrusions

7Inversepole guresforextrusionaxisdirectionshowingbulktexturesofasextrudedandannealedAZ31,WE43and

ZC71:aAZ31asextruded,bZC71asextruded,cWE43asextruded,dAZ31annealed,eZC71annealed,fWE43annealed

DiscussionsweepacrossamicrostructuretoproducenewstrainfreeAsextrudedmicrostructuresgrains.Similarpartiallyrecrystallisedmicrostructures

havebeenreportedinAZ31hydrostaticallyextrudedat

IntheextrudedmicrostructuresshowninFigs.2–5the300uC.3

grainsaresmallerthanthoseobservedintheannealedInextrudedZC71(Fig.3),theLABsdissectingthedirectchillcastbillets(Fig.1a–c)becauserecrystallisa-unrecrystallisedregionsmaybedeformationinducedtionhasoccurredduringextrusion.Thebimodalgrainboundaries.InextrudedWE43(Fig.4),HABsextendsizedistributionsarisebecausetheextrusionsareacrosstheunrecrystallisedregion.TheseHABsarepartiallyrecrystallised;thelargegrainsinthecentreofparalleltooneanother,althoughEBSDdataindicatesFigs.2–5areunrecrystallised,whilethesmallergrainsthattheydonothavetwinorientation.Theymaybearerecrystallised.Theunrecrystallisedgrainscontainedkinkbands25thathavearisenasaresultofhighcom-asubstructureconsistingofahighdensityofLABsthatpatibilitystressesgeneratedingrainboundaryregions.developedduringdeformation.MostofthesurroundingLABsform,andasdeformationcontinues,themisor-smallrecrystallisedgrainscontainlittleornodeforma-ientationacrosstheseboundariesincreasesuntiltheytionsubstructurebecauseduringrecrystallisationHABsbecomeHABs.Deformationinducedboundaries,

suchTable2Tensileandcompressive0?2%yieldstrengthsandtensile/compressive0?2%yieldstrengthratios,forAZ31,

WE43andZC71inasextrudedandannealedconditions

AsextrudedAnnealed

Tensile,MPaCompressive,MPaRatioTensile,MPaCompressive,MPaRatio

AZ31170871325113251150ZC71213.63199.551..3010663141WE43185.28183.91.07222

101.6494.

10893.282.36

115780.94

MaterialsScienceandTechnology2007VOL23NO101177

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