資源描述：
《SiC_p復(fù)合材料組織和力學(xué)性能的影響（英文）.pdf》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、Availableonlineat、^『、『1n^f．sciencedirect．tom．一，，Transactionsof·：：，ScienceDirectNonferrousMetals愛SocietyofChinaPressTrans．NonferrousMet．Soc．China22(2012)2080-2086www．tnlnsc．cnEffectofheattreatmentonmicrostructureandmechanicalpropertyofextruded7090／SICpcompositeYUANWu—hua，ANBa
2、i-lingCollegeofMaterialsScienceandEngineering，HunanUniversity，Changsha410082，ChinaReceived9September2011；accepted16January2012Abstract：TheultrahighstrengthSiCparticles(SiCp)reinforcedA1—1O％ZTr3．6％Mg—1．8％Cu-0．36％Zr-0．15％Nicompositewaspreparedbysprayco—deposition．Microstructur
3、esoftheextrudedanddifferentheat—treatedbarswereanalyzedbytransmissionelectronmicroscopy(TEM)andenergydispersivespectrometryrEDS)．Grainsizeofthecompositespreparedbytwo-stagesolutionissmallerthanthatbysingle-stagesolution．Aftersingle-stagesolutionagingtreatment，fineprecipitate
4、sofbothandA1ZnMgCu—richphasecanbefoundbothintragranularlyandintergranularly．Ⅵ，11ileafterthetwo—stagesolution．a(chǎn)namorphousSi-Cu—A1一Or5nm)layerappearsattheinterface．TheadditionofNiandZrmodifiedtheinfluenceofthetwo．stagesolutionandinhibitedthegrowthofthe7090／SICpcompositegrainsi
5、ze．Heattreatmentscansignificantlyimprovethefracturetoughnessofthecomposite．Thefracturetoughnessfirstdecreasesthenincreaseswiththeelongationoftheagingtime．Keywords：A1matrixcomposite；sprayco—deposition；heattreatment；solidsolution；aging；microstructure；interface；fracturetoughnes
6、sascribedtothelargedifferenceinthermalexpansion1IntroductiOllcoefficientbetweentheSiCandmatrix『51．FracturetoughnessofthecompositesdecreaseswiththeMetalmatrixcompositesarewidelyusedbecauseofincrementinvolumefractionofSiCparticlesf61．Heattheirhighspecificstrength，lowdensity，go
7、odhottreatmentisaprimaryprocessforaluminumalloy，workability．1owthermalexpansioncoefficientandgoodduringwhichthesolublesecondphasecanbedissolveddimensionalstability[1]．The7090／SICDcompositesintothematrix．Moreover，thesecondphasecanre．werewidelyusedintheareaofaerospace，military
8、，cardissolvemoreadequatelyatahighersolutionandelectronicinstrument．TheSiCre
