Ti复合材料的显微组织和力学性能的影响.pdf

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1、Availableonlineatwww．sciencedirect．cornTransactionsofScienceDirectNonferrousMetalsSocietyofChinaELSEVIERPressTrans．NonferrousMet．Soc．China24(2014)1737—1743wWW．tnmsc．cnMicrostructureandmechanicalpropertiesof(TiB十La203)／TicompositesheattreatedatdirenttemperaturesXiang—longGUO，Li—qiangWANG,Ji．ning

2、Q，Wei-jieLO，DiZHANGStateKeyLaboratoryofMetalMatrixComposites，ShanghaiJiaoTongUniversity，Shanghai200240，ChinaReceivedI1March2013；accepted8March2014Abstract：Near-atitaniummatrixcompositesreinforcedwithTiBandLa，O1weresynthesizedbycommoncastingandhot—workingtechnology．Theeffectsofheattreatmenttempe

3、ratureonthemicrostructureandthetensilepropertiesoftheinsitusynthesized(TiB+La2O3)／Tiwerestudied．Microstructurewasstudiedbv0MandTEM。andtensiletestswerecarriedoutatroomtemperatureand923K，respectively．Resultsshowthatwiththeincreaseofflheattreatmenttemperature，priorflphasegrainsizeincreasesandacolo

4、nysizedecreases．Roomtemperaturetensilestrengthincreaseswiththeincreaseofheattreatmenttemperature，whichcanbeattributedtothedecreaseofacolonysizewiththeincreaseofheattreatmenttemperature．However,high—temperaturetensilestrengthdecreaseswiththeincreaseofheattreatmenttemperatureandthedecreaseofthehi

5、gh—temperaturetensilestrengthisduetotheincreaseofthepriorflphasegrainsize．Keywords：titaniummatrixcomposites；microstructure；mechanica1propertiestraditional(o[斗)heattreatment，heattreatmentoffersalIntrOductiOnfully1amellarmicrostructure．whichimprovesthecreepresistance，high．temperaturetensilestreng

6、th，oxidationAsaresultoftheincreasinglysevererequirementresistanceandfracturetoughnesspropertiesoftheforhigh—performancestructuralmaterialintheaerotitaniumalloy．ZHANGetal『91reportedthatheatindustry,titaniummatrixcompositeshavebeentreatmentmethodcangreatlychangethemicrostructureextensivelystudied

7、duetothelowdensit)，，hi曲strength，andmechanicalpropertiesofTi-6A1-2Cr一2Mo-2Sn-highmodulusandcorrosionresistance[卜3】．Moreover，2Zralloy．FILIPetal『101demons仃atedthatheatconventionaltechniques，suchaspowdermetallurgy，treatmentleadstohigh