稀土Y对SPS烧结TiAI基合金显微组织与力学性能的影响-论文.pdf

《稀土Y对SPS烧结TiAI基合金显微组织与力学性能的影响-论文.pdf》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、RareMetalMaterialsandEngineeringAvailableonlineatwww．sciencedirect．comVolume42，Issue1，January2013OnlineEnglisheditionoftheChineselanguagejourna棼ScienceDirectEffectofYAdditiononMiCrOStrUCtUreandMechanicaIPropertiesofTiAI-·basedAlloysPreparedbySPSXiaoShulong

2、’，XuLijuan’，一，YuHongbao。，ChenYuyong’，’HarbinInstituteofTechnology,Harbin150001，China；NationalKeyLaboratoryforPrecisionHotProcessingofMetals，HarbinInstituteofTechnology,Harbin150001，China；。NorthwesternPolytechnicalUniversity,Xi'an710072，ChinaAbstract：TiAlal

3、loyswithacompositionofTi．45Al一2Cr一2Nb．1B一0．5Ta(at％1(TAalloy)andTi一45Al一2Cr．2Nb．1B．0．5Ta．0．225Y(at％)(TAYalloy)werepreparedbydoublemechanicalmillingandsparkplasmasintering(SPS)．TheeffectofYadditiononmicrOstructureandmechanicalpropertiesofTiA1．basedalloyswass

4、tudied．Theresultsshowthatthemorphologyofdoublemechanicalmillingpowderisregularwithsizesintherangeof20-40／am．ThemainphasesofTiA1andTi3A】andfewphasesofTi2AlandTiB2wereobservedintheSPSbulksamplesofTiAl—basedalloys．Theequiaxedcrystalgrainmicrostructurewasachie

5、vedwithsizesintherangeOf100-400nminTAalloysamples．Thesamplesexhibitedcompressivepropertiesatroomtemperaturewithacompressivestrengthof2614MPaandacompressionratioof20．57％．ForTAYalloy．thesizesofequiaxedcrystalgrainobviouslydecreased．Thesamplesexhibitedcompres

6、sivepropertiesatroomtemperaturewithacompressivestrengthof2677MPaandacompressionratioof22．91％．Themicro．hardnessoftheSPSbulksamplesofTAalloywasobviouslyhigherthanthatoftheSPSbulksamplesofTAYalloy．Onthebaseofanalysisoffractographs．itshowedthatthecompressionfr

7、acturetransformoftheSPSTiA1．basedalloyssampleswasintergranularrupture．Keywords：TiA1一basedalloys；sparkplasmasintering(SPS)；microstructure；mechanicalproperties；fractographyInrecentyears。TiA1．basedalloyshavebeendevelopedasofsuchalloys．attractivecandidatemater

8、ialsforaerospacestructuralandSparkplasmasintering(sPs)isfoundtocompactengineapplicationsduetotheirlowdensity,highspecificpowderssatisfactorilythroughthesimultaneousapplicationstrengthandrelativelygoodproperti