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1、Availableonlineat、^n^n^，．sciencedirect．com一TransactionsofScienceDirectNonferrousMetalsSocietyofChinaEIS]巳ⅥERPressTrans．NonferrousMet．Soc．China24(2014、82—88www．tnmsc．cnMicrostructuresofTC21alloysafterhydrogenationanddehydrogenationXiao—liWANG，Yong．qingZHAO，Xiao．weiWEI，Hong．1iangHOU1．Schoolo
2、fMaterialScienceandEngineering，XihuaUniversity,Chengdu610039，China；2．NorthwestInstituteforNonferrousMetalResearch，Xi’an710016，China；3．BeijingAeronauticalManufacturingTechnologyResearchInstitute，Beijing100024，ChinaReceived27May2013；accepted12November2013Abstract：Microstructura1evolutionandp
3、hasetransformationofhydrogenatedanddehydrogenatedTC21alloyswereinvestigatedbyopticalmicroscopy(0M)，X—raydiffraction(XRD)andtransmissionelectronmicroscopy(TEM)．xRDpeaksofaandphasesafterhVdrogenationshiftedto1owanglebecauseoflatticeexpansionwiththesolutionofhvdrogenatoms．MicrostructureofTC21
4、alloyafterhvdrogenationchangedapparently．Comparedtotheas—receivedone，thecontrastsofequiaxedphaseandtransformedphaseunderopticalmicroscopewerereversed．Inaddition．XRDandTEManalysesrevealedthathydridesanddmartensiteprecipitatedfromaandphases．BulkoftwinsandsomeTiAlparticleswereobservedinhydrog
5、enatedTC21alloy,whichmeansthathvdrogenledtotheredistributionofalloyingelementsindandphase．Atierdehydrogenation，themicrostructureofTC21alloywassimilartothatoftheas—receivedone，whichconsistedofnandphases．Keywords：hydride；TiAlphase；martensite；twinworkablephase；dislocationmobilityandstimulated
6、1IntrOductiOnevolutionofdynamicrecrystallizationduringhotworking．CHENeta1『8]investigatedtheeffectofTi-6A1-2Sn-2Zr3Mo一1Cr_-1Nb(TC21、alloyisahydrogenonhightemperatureyieldstrengthofTi-60newa／flhighstrengthandtoughnessalloyasacandidatealloy．Theexperimentalresultsshowedthathighmaterialforstruc
7、turalpartsofadvancedaircraft『卜3]．temperatureyieldstrengthofTi-60alloycontinuouslyHowever．highcostofmachiningattributedtolowlimitdecreasedwithincreasinghydrogencontents，anditofdeformation．highdeformationresistance，highflowreducedabout70％at900。Cforthealloycontai
