γ-TiAl合金高温塑性变形力学行为及本构模型的研究进展（英文）.docx

γ-TiAl合金高温塑性变形力学行为及本构模型的研究进展（英文）
ResearchProgressonHighTemperaturePlasticDeformationBehaviorandConstitutiveModelofγ-TiAlAlloy
Abstract:
γ-TiAlalloyshavebeenwidelyusedinaerospaceandautomotiveindustriesduetotheirexcellenthigh-temperatureproperties,suchashighstrength-to-weightratio,goodcorrosionresistance,andlowdensity.However,theunderstandingoftheirhigh-temperatureplasticdeformationbehaviorandthedevelopmentofconstitutivemodelsarestillongoingresearchtopics.Thispaperreviewstheresearchprogressonthehigh-temperatureplasticdeformationbehaviorandconstitutivemodelsofγ-TiAlalloys.
1.Introduction:
γ-TiAlalloysareintermetalliccompoundscomposedofaγ-TiAlphaseandasmallamountofα2-Ti3Alphase.Theypossessauniquecombinationofproperties,makingthemattractiveforvariousapplicationsinhigh-temperatureenvironments.However,thelimitedductilityandpoorworkabilityathightemperatureshavehinderedtheirwidespreaduse.Understandingtheplasticdeformationbehaviorathightemperaturesandestablishingaccurateconstitutivemodelsareessentialforimprovingtheperformanceofγ-TiAlalloys.
2.HighTemperaturePlasticDeformationBehavior:
2.1.DynamicRecoveryandRecrystallization:
Duringplasticdeformationathightemperatures,γ-TiAlalloysundergodynamicrecoveryanddynamicrecrystallizationprocesses.Dynamicrecoverycanreducedislocationdensityandincreasegrainsize,promotingtheimprovementofworkabilityandductility.Dynamicrecrystallizationleadstotheformationofnewgrainswithlowdislocationdensity,whichfurtherenhancesthehigh-temperaturemechanicalproperties.
2.2.TwinningandSlip:
Twinningandsliparethepredominantdeformationmechanismsinγ-TiAlalloys.Twinsarecommonlyobservedatroomtemperature,buttheircontributiontoplasticdeformationdecreasesathightemperatures.Slip,ontheotherhand,becomesthedominantdeformationmechanismatelevatedtemperatures.Slipsystemsinγ-TiAlalloysincludebasalslip,pyramidalslip,andprismaticslip.Theactivationofdifferentslipsystemsdependsontemperature,strainrate,andcrystallographicorientation.
3.ConstitutiveModeling:
Thedevelopmentofconstitu