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1、Actnnxzfer.Vol.45,No.10,pi’.42314240,1997Q1997ActaMetallurgicaInc.PergamonPublishedbyElsevierScienceLtd.411rightsreservedPrintedinGreatBritainPII:s1359-6454(97)00070-01359-64541’$17.0097+0.00AUNIFIEDTHEORYOFRECOVERY,RECRYSTALLIZATIONANDGRAINGROWTH,BASEDONTHESTABILITYANDGROWTHOFCELLULARMICROSTRUCTU
2、RES-I.THEBASICMODELF.J.HUMPHREYSManchesterMaterialsScienceCentre,UMIST,GrosvenorStreet,ManchesterMl7HS.U.K.(Received4November1996;accepted27January1997)Abstract-Ananalysisofthegrowthandstabilityofcellularmicrostructures.whichtakesaccountoftheorientationdependenceofboundaryenergiesandmobilities,isp
3、resentedandusedtodevelopasimpleunifiedtheoryofcontinuousanddiscontinuousrecovery,recrystallizationandgraingrowth.Theanalysisshowsthatlowanglesubgrainstructuresareintrinsicallyveryunstablewhilstmediumtohighanglestructuresmaybeverystable.Themodelisusedtoanalysediscontinuoussubgraingrowth,primaryrecr
4、ystallization,theeffectsoftextureongraingrowthandthestabilityofhighlystrainedmetals.II”1997ActaMetallurgicaInc.1.INTRODUCTIONbepossible,andthisisthethemeofthecurrentwork.Suchanapproachnotonlyemphasizer.thecommonAmaterialwithamicrostructureofdislocations,featuresofthevariousprocesses,but,inbreaking
5、subgrainsorgrainsmayloweritsenergybythedowntheconventionaldistinctionsbetweentheprocessesofrecovery,recrystallizationorgrainvariousannealingphenomena,allowsforthegrowth[I].Untilcomparativelyrecently,thedistinc-emergenceofnewphenomenawhilzhmaynottionsbetweentheseprocessesappearedtobeconvenientlyfit
6、intothetraditionalcal.egories.reasonablyclear,buttheincreasingsophisticationofthetoolsformicrostructuralcharacterizationnowshowsusthattheborderlinesbetweenthese2.THEMODELphenomenaareoftenblurredandnewlydiscoveredIfamaterialdoesnotcontainmanyfreemicrostructuralchangesmaynoteasilyfitintodislocations
7、andifthemicrostructurecanbewell-definedcategories.consideredtobeoneofsubgrainsandgrains,thenallItisnowknownthatallthreeoftheabovesixannealingphenomenacanbeconsideredtooccurphenomenamayoccurinthefollowingways.They
