SiC_p复合材料组织和力学性能的影响（英文）.pdf

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1、Availableonlineat、^『、『1n^f．sciencedirect．tom．一，，Transactionsof·：：，ScienceDirectNonferrousMetals爱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．anamorphousSi-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