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1、REPORTSAbnormalGrainGrowthInducedtechniquetoanalyzethemicrostructureintheinitialstageofthegraingrowth.InFigure3,panelsAandB,respectively,showthequasi-byCyclicHeatTreatmentcoloredorientationmappingofthebphaseandthegrainreferenceorientationdeviationindi-catingthedeviationfromtheaverag
2、eorientation11111ToshihiroOmori,*TomoeKusama,ShingoKawata,IkuoOhnuma,YujiSutou,ofthegrainforCu71.6Al17Mn11.4quenchedfrom211YoshikazuAraki,KiyohitoIshida,RyosukeKainuma730°C,whichisjustabovetheasolvustem-perature(726°C).Surprisingly,smallsubgrainsInpolycrystallinematerials,graingrowt
3、hoccursatelevatedtemperaturestoreducethetotalareawithameandiameterof~100mm,possessingofgrainboundarieswithhighenergy.Thegraingrowthrateusuallyslowsdownwithannealingorientationdeviationsfrom1°to2°toonean-time,makingithardtoobtaingrainslargerthanamillimeterinsize.Wereportacrystalgrowt
4、hother,areobservedineverypreexistinggrain.Amethodthatemploysonlyacyclicheattreatmenttoobtainasinglecrystalofmorethanseveralsimilarsubgrainstructureisformedbyrecoverycentimetersinacopper-basedshape-memoryalloy.Thisabnormalgraingrowthphenomenonthroughdeformationandlow-temperatureannea
5、l-resultsfromtheformationofasubgrainstructureintroducedthroughphasetransformation.Theseing.Thesubgrains,however,areconsumedbyre-findingsprovideamethodoffabricatingasingle-crystalorlarge-grainstructureimportantforcrystallizationthroughfurtherhigh-temperatureshape-memoryproperties,mag
6、neticproperties,andcreepproperties,amongothers.annealing.Thus,thefullyrecrystallizedspeci-mencontainsonlyalowdensityofdislocationsostmetalsandceramicshaveapoly-sequentannealingwithatemperaturegradientandsubboundariesintherecrystallizedgrains.crystallinestructurethatiscomposed(7–9).A
7、nothertechniquetoproducealargeInthepresentcase,becausethespecimenswereMofsingle-crystallinegrainsseparatedbygrainorasinglecrystalinthesolidstateistheinitiallyannealedatahighenoughtemperatureinterfaces,calledgrainboundaries(GBs).TheredynamicAGG,consistingofplasticstrainingtocompletet
8、herecrystallization