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1、MaterialsLetters59(2005)894–900www.elsevier.com/locate/matletMicrostructurecharacterizationandtensilepropertiesofsqueeze-castAlSiMgalloysM.T.AbouEl-khair*NonFerrousLaboratory,CentralMetallurgicalResearchandDevelopmentInstitute(CMRDI),P.O.B.87Helwan,Cairo,EgyptReceived24March2004;re
2、ceivedinrevisedform20November2004;accepted27November2004Availableonline10December2004AbstractAresearchprogramwasconductedtostudytheeffectsofsqueezepressure(70,100and160MPa)andheattreatmentT6onthestructure,hardnessandtensilepropertiesofcastAl6Si0.3Mgalloys.Theinfluenceofsqueezepress
3、ureonmacro-andmicrostructuresofAl6Si0.3Mgalloyshasbeeninvestigated.Someofcastingsweresolutiontreatedat5408Cforvarioustimesandothersweresubjectedtoagingat1708Caftersolutiontreatment.Theresultsindicatedthatprecipitationoccurredwithinabout30minforbothcastandsqueezecastalloys.Thehardne
4、ssbegantoincreaseandmaximumvalueswereobservedafterabout10hforas-castalloy.Increasingofsqueezepressure(70–160MPa)acceleratedstrengthofthealloysfrom8to4h,respectively.Squeezepressuresdecreasedthepercentageofporosityandincreasedthedensity,alsoitdecreasedthegrainsizeofa-Alandmodifiedth
5、eSieutectic.Hardnessandtensilepropertiesincreasedwithbothheattreatmentandincreasingofsqueezepressure.D2004ElsevierB.V.Allrightsreserved.Keywords:AlSiMg;Squeezecasting;Soundness;Macro-/microstructure;Aging;Tensileproperties1.IntroductionThemechanicalpropertiesofcastAlSiMgalloysarede
6、terminedbychemicalcomposition,rateofsolidification,Theuseoflight-metalcomponentsinvariouscaststructureanditsintegrityandheattreatment.applicationshasincreasedduringthelastdecade,partlyGenerally,alloycompositioneffectsareindependentofasaresultoftheincreasedamountoflightmetalscasting
7、techniqueswhereastherateofsolidificationofbeingusedfortransportationpurposes.Oneadvantageiscaststructure,andheattreatmentproceduresareprocessthatlight-metalcomponentsleadtoanoverallreduceddependent[6–8].weightand,thus,toreducedenergyconsumption.Also,themechanicalpropertiesofthecast
8、ingsareAnotheradvantage,wh
