al2o3·sio2sfal复合材料基体成份优化及耐磨性能研究word格式论文.docx

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al2o3·sio2sfal复合材料基体成份优化及耐磨性能研究word格式论文.docx

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al2o3·sio2sfal复合材料基体成份优化及耐磨性能研究word格式论文

AbstractTheAl2O3·SiO2sf/Alcompositeswerefabricatedbysqueezecastingmethod. TheAl,Al-Cu,andAl-Cu-Mgalloyswereselectedasthematrix,respectively, whichwereadjustedso astoget composites withexcellentpropertyand lowcost. TheresearchprovidedatheoreticalbaseforfindingakindofshortfiberreinforcementAlmatrixcompositematerial forciviluse.ThemicrostructureandinterfaceofAl2O3·SiO2sf/AlcompositesareinvestigatedbySEM,TEMandDEX.TheresultsshowedthatduringthemanufacturingprocessofAl2O3·SiO2sf/Alcomposites,therewasachemicalreactionbetweentheliquidAlandtheSiO2amorphouslayeron thefibersurface.Therefore,thesilicondissolvedintomatrixalloyorprecipitatedassinglecrystalsiliconphase.TheaggregationofCuelementwhichgeneratedattheinterfaceof thefibercouldeffectivelypreventorinhibitthereaction.WhentheCucontentincreasedto5%,thereactionattheinterfacebasicallydidnotoccur,thesoluteatomsinthematrixchangedfromsilicontoCu.Inaddition,smallamountof CuAl2phaseprecipitatedatthelocalareaofinterface.X-rayresultsshowedthatCuAl2O4spinelandMgAl2O4spinelwereformedintheAl2O3·SiO2sf/Al-Cuand Al2O3·SiO2sf/(2024Al+Mg)composites.GibbsenergycalculationofpossiblereactionsinAl2O3·SiO2sf/Al-CuandAl2O3·SiO2sf/(2024Al+Mg)compositesshowsthatCuAl2O4isobtainedthroughoxidationofCuAl2,notthereactionproductof the interface,andthatMgAl2O4wasthereaction productbetween fiberandmatrixalloyduringextrusion cladding.The agehardeningprecipitation behavior of Al2O3·SiO2sf/Al-Cuand Al2O3·SiO2sf/(2024Al+Mg)compositeswasstudied.ResultsshowedthatwiththeincreasingofCucontent,thehardnesswasincreased,andthepeakagingtimewasshortened.Theeffectwasthemostobvious whenaging at temperature190oC.WiththeincreasingofMgcontentthepeakagingtimewaspostponedandthetemperaturerangeofpeakagingwasenlarged.Themostobviouseffectofagingtreatmentwasat185oC.TheresultsofhardnesstestandmicrostructureobservationshowedthattheprecipitationofAl2O3·SiO2sf/(2024Al+1%Mg)was fine and acicular, which provided with the best effect of strengthening andplasticity.Somebulkprecipitation,w