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时效工艺对1．0％Ni—5．0％Sn铝合金组织和硬度的影响.docx

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时效工艺对1．0％Ni—5．0％Sn铝合金组织和硬度的影响 Introduction Aluminumalloyshavewideapplicationsinvariousindustriesowingtotheirexcellentmechanicalpropertiesandlightweight.Theadditionofnickel(Ni)andtin(Sn)toaluminumalloyssignificantlyimprovestheirstrength,hardness,andtoughness.Themicrostructureandmechanicalpropertiesofaluminumalloysstronglydependontheprocessingparameters,includingtheheatingrate,soakingtime,holdingtemperature,coolingrate,andpost-heattreatment.Inthisstudy,weinvestigatetheeffectoftime-temperatureparametersonthemicrostructureandmechanicalpropertiesof1.0wt.%Ni-5.0wt.%Snaluminumalloy. ExperimentalMethod Thealuminumalloywasmeltedinahigh-frequencyinductionfurnaceundertheargonatmosphere.Thechemicalcompositionofthealloywasverifiedusinganopticalemissionspectrometer.Theingotswerehomogenizedatatemperatureof500°Cfor3hoursandthenhotrolledtoathicknessof4mm.Thesampleswerecutfromtherolledplatesandsubjectedtodifferentheattreatments.Theheattreatmentswereconductedinafurnacewithacontrolledatmosphere.Thetemperaturerange,holdingtime,andcoolingratewerevariedtostudytheireffectonthemicrostructureandhardnessofaluminumalloy. MicrostructuralAnalysis Themicrostructuresofthesampleswerecharacterizedusingopticalmicroscopy(OM)andscanningelectronmicroscopy(SEM).TheOMimagesrevealedthegrainsize,distribution,andshapeofthegrainsinthealuminumalloy.TheSEMimagesprovidedadetailedanalysisofthetexture,morphology,andcompositionofthephasespresentinthealloy. Themicrostructureofthealloywasfoundtobestronglyinfluencedbytheheattreatmentparameters.Thesamplestreatedathighertemperaturesshowedsignificantgraingrowth,whilethosetreatedatlowertemperaturesexhibitedfineandequiaxedgrains.Thesamplestreatedforlongerholdingtimesshowedcoarsergrains,andthosetreatedforshortertimesexhibitedfinergrains.Thecoolingrateafterheattreatmenthadaprofoundeffectonthefinalmicrostructureofthealloy.Thesamplesquenchedinwaterexhibitedafineanduniformmicrostructure,whilethosecooledslowlyinairexhibitedacoarseandnon-uniformmicrostructure. MechanicalPropertie