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1、TheStudyonCastingPropertiesandProcesstechnologyofZL205AHighStrengthAluminumAlloyAbstractZL205Aalloyisakindoftraditionalhighstrength-toughnesscastaluminumalloy,haveverygoodstrength,plastic,toughnessandresistancetocorrosion,sowidelyusedintheaerospacefield.However,thepoorpe
2、rformanceofcasting,applicationofmaterialslimitedmaterial,whichhastheattractedextensiveattention.AsthecastingpropertiesofcommonZL205Aalloyisrelativelyworseandcannotmeettheneedofuseofsomeimportantparts,theapplicationofcommonZL205Aalloyislimited.Soithasbeenapropositionofmat
3、erialresearchersthathowtoimprovethemechanicalpropertiesofcommonZL205Aalloy.Thepaperhaspassedtheorthogonaltext,andascertainedtheoptimumpurificationprocesstothealloyZL205A・TheC2CI6addedmeasures0.7%,thetemperatureofthealuminiumliquidis730°C,andthestewingtimeis8mins.Thepaper
4、focusesonthefluidity,bodyShrinkageandtendencyofhotcrackingofZL205Aalloy.ThroughthecontrastexperimentwithZL702Aalloy,analyzesthecastingpropertyofZL205Aalloy.Bychangingthecomponentandthepouringtemperature,itanalyseshowthesefactorsinfluenceontheperformanceofthealloycastings
5、.Ithaspassedtheorthogonaltext,andascertainedtheoptimumheattreatmentprocesstothealloyZL205A.Thesolutiontemperatureischosen540°C,thesolutiontimeischosen20h,andtheagingtemperatureischosen180°C5theagingtimeischosen3h.Theinfluenceofthemechanicalpropertyandthetendencyofhotcrac
6、kingofZL205Abasbeeninvestigatedpassingtheorthogonaltext.SmallamountofLaandCeexistsintheformofAUCe,AhLaphasesinthealloy.TherareearthelementsinteractwithAl、CuandMnformingAhCuCe、Ah4Cu3Ce3MnandAlsCmLaintermetallicsinstandofAUCeandAhLaphases,whensuperfluousrareearthelementsex
7、istsinthealuminum.Theseintermetallicsmakethealloycomprehensivepropertiesdroppeddrastically.Theresultsobtainedshowthatanadditionofrareearthelementswilllowertosomeextentquasi-solidustemperature,widenquasi-liquidregionandnarrowquasi-solidregion.Rareearthsenhancethestrengtha
8、roundsolidusandtherateofstrengthincreaseofthealloy.Moreover,theyareabletodecreasethetendencyofhotcracki
