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晶体塑性模拟在等通道转角挤压中的应用(英文).docx

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晶体塑性模拟在等通道转角挤压中的应用(英文) ApplicationofCrystalPlasticitySimulationinEqualChannelAngularExtrusion Equalchannelangularextrusion(ECAE)isawell-knownsevereplasticdeformation(SPD)technique,widelyusedtoenhancethemechanicalpropertiesofmetalsandalloysbyrefiningthegrainsize.Itinvolvesthedeformationofmetalbilletsorrodsusingaspeciallydesigneddiewithtwointersectingchannelsofequalcross-sectionbutdifferentorientations.Themetalbilletsareforcedthroughthesechannels,whichcausesignificantdeformationduetotheimposedshearstrain.However,thedeformationmechanismsinECAEarecomplexduetothepresenceofmultiplestraincomponentsandtheevolutionofgrainstructure,whichrequiresadvancedcomputationalmethodstosimulate. Crystalplasticitysimulation(CPS)isapowerfultechniquetomodelthedeformationbehaviorofpolycrystallinematerialsatamicroscopiclevel.Ittakesintoaccounttheeffectofcrystallographictexture,grainmorphology,dislocationactivity,andotherfactorsthatinfluenceplasticityinmetalsandalloys.CPShasbeensuccessfullyappliedtostudythemechanicalbehaviorofawiderangeofmaterials,includingsteels,aluminumalloys,magnesiumalloys,andtitaniumalloys.Inthispaper,wediscusstheapplicationofCPSinECAEanditsroleinpredictingthedeformationbehaviorandmicrostructuralevolutionofmetalalloysduringthisprocess. TheECAEprocessischaracterizedbytheimpositionofhighshearstrainonthemetalbilletsalongtheshearplane.CPScanbeusedtomodelthestressandstraindistributionacrossthegrainboundariesandwithinthegrainsduringthisprocess.Themechanicalpropertiesofthemetalsuchasyieldstrength,tensilestrength,andductilitycanbepredictedusingtheCPSsimulations.Thesimulationscanalsobeusedtoevaluatetheeffectofvariousparameters,suchasdieangle,strainrate,andtemperature,ontheECAEprocess. CPSsimulationshavealsobeenusedtopredictthegrainsizerefinementandtextureevolutionduringECAE.ThegrainsizeintheECAEprocessedmaterialissignificantlyreducedduetothehighshearstrainimposedduringtheprocess.Thedeformationbehaviorofindividualgrainsinthepolycrystallinematerialisaffectedbythemicrostructure,grain