热处理对a356铝合金组织结构和力学性能的影响毕业外文翻译名师资料合集（完整版）资料(可以直接使用，可编辑优秀版资料，欢迎下载）EffectofheattreatmentonmicrostructureandtensilepropertiesofA356alloysPENGJi-hua1,TANGXiao-long1,HEJian-ting1,XUDe-ying21.SchoolofMaterialsScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,China;2.InstituteofNonferrousMetal,GuangzhouJinbangNonferrousCo.Ltd.,Guangzhou510340,ChinaReceived17June2021;accepted15August2021AbstractTwoheattreatmentsofA356alloyswithcombinedadditionofrareearthandstrontiumwereconducted.T6treatmentisalongtimetreatment(solutionat535℃for4h+agingat150℃for15h).Theothertreatmentisashorttimetreatment(solutionat550℃for2h+agingat170℃for2h).TheeffectsofheattreatmentonmicrostructureandtensilepropertiesoftheAl-7%Si-0.3%Mgalloyswereinvestigatedbyopticalmicroscopy,scanningelectronicmicroscopyandtensiontest.Itisfoundthata2hsolutionat550℃issufficienttomakehomogenizationandsaturationofmagnesiumandsiliconinα(Al)phase,spheroidofeutecticSiphase.Followedbysolution,a2hartificialagingat170℃isalmostenoughtoproducehardeningprecipitates.ThosesamplestreatedwithT6achievethemaximumtensilestrengthandfractureelongation.Withshorttimetreatment(ST),samplescanreach90%ofthemaximumyieldstrength,95%ofthemaximumstrength,and80%ofthemaximumelongation.Keywords:Al-Sicastingalloys;heattreatment;tensileproperty;microstructuralevolution1IntroductionTheaging-hardenablecastaluminumalloys,suchasA356,arebeingincreasinglyusedintheautomotiveindustryduetotheirrelativelyhighspecificstrengthandlowcost,providingaffordableimprovementsinfuelefficiency.EutecticstructureofA390canberefinedanditspropertiescanbeimprovedbyoptimizedheattreatment.T6heattreatmentisusuallyusedtoimprovefracturetoughnessandyieldstrength.ItisreportedthatthosefactorsinfluencingtheefficiencyofheattreatmentofAl-Sihypoeutecticalloysincludenotonlythetemperatureandholdingtime,butalsotheas-castmicrostructureandalloyingaddition.SomeT6treatmenttestmethodstandardsofA356alloysaremadeinChina,USA,andJapan,andtheyarewellaccepted.However,theyn