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一种新型高强β钛合金力学性能和显微组织的关系研究（英文）.docx

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一种新型高强β钛合金力学性能和显微组织的关系研究（英文） ResearchontheRelationshipbetweenMechanicalPropertiesandMicrostructureofaNewHigh-Strengthβ-TitaniumAlloy Introduction: Titaniumalloysarewidelyusedinaerospace,biomedicalengineering,andotherfieldsduetotheirexcellentmechanicalpropertiesandbiocompatibility.Amongalltypesoftitaniumalloys,β-titaniumalloyswithhighstrengthandgoodductilityareattractingincreasingattention.However,themicrostructureofβ-titaniumalloysgreatlyinfluencestheirmechanicalproperties,andthecomplexphasetransformationbehaviorduringprocessingmakesitchallengingtocontrolthemicrostructure. Inthispaper,weinvestigatetherelationshipbetweenmechanicalpropertiesandmicrostructureofanewhigh-strengthβ-titaniumalloy,aimingtounderstandhowmicrostructureaffectsmechanicalpropertiesandoptimizetheprocessingconditionsforbetterproperties. ExperimentalMethods: Theβ-titaniumalloywaspreparedbyvacuumarcmelting,followedbyhotforgingandhotrolling.Themicrostructureofthealloywascharacterizedbyscanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM).Mechanicalproperties,includingtensilestrength,yieldstrength,andelongation,weremeasuredbyauniversaltestingmachine. ResultsandDiscussion: TheSEMimagesofthealloyshowthatthemicrostructureiscomposedofequiaxedβgrainsdistributedrandomly.TEMobservationindicatesthattheseβgrainsarecomposedofamixtureofαandβphases.Additionally,weobservedasmallamountofα-phaseprecipitatesdistributedalongthegrainboundaries. Themechanicalpropertiesofthealloyarestronglydependentonitsmicrostructure.Theyieldstrengthandultimatetensilestrengthincreasewiththedecreaseingrainsize,whichisattributedtotheHall-Petcheffect.Moreover,theelongationdecreaseswiththedecreaseingrainsize,whichisduetothelimitedstrainhardeningcapacityofsmallgrainsandtheprematureformationofadiabaticshearbands.Theformationofα-phaseprecipitatesalonggrainboundariesreducestheductilityofthealloy,asitactsasanucleationsiteforcracks.Furthermore,wefindthatthestrainratesensitivitycoefficientisrelativelylowforthealloy,suggestinglimited