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2003120032RESEARCHSTUDIESONFOUNDRYEQUIPMENTFeb.20031:2002-11-13:(1974-),,:(974040100)1,1,12(11,471003;21(),471004):,-,,,:;:TG292:A:1004-6178(2003)01-0012-04StudyonMechanismofTiandZrModificationofHighAluminumZAalloyHouPing2jun1,NiFeng1,LongRui1,WuHong2li2(1.MaterialScienceandEngineeringDepartmentofLuoyangInstituteofTechnology,Luoyang471003,China;2.YiTuo(Luoyang)ConstructionMachineryCo.Ltd.,Luoyang4710004,China)Abstract:Theductilityofhigh2aluminumZAalloyscanbeincreasedbymeansofTiandZrmodification,howeverthereisdis2agreementintheirmodificationmechanism.Withunidirectionalsolidificationandquenching,SEMandenergyspectrometry,compoundphasesformingaftermodificationwereseenexistingonborderoroutofphase.SotheauthorregardsthatmechanismofTiandZrmodificationdoesnotlieinquantityefficientcrystalcoreprovidedbythem,butoccurrenceofperitecticreactionatconditionofhightemperatureleadingtheproductionofphaseKeywords:highaluminumZAalloy;mechanismofmodification20[1,2],[3-7],,:,Al3TiAl3ZrAl5Ti2ZnTiB2TiB(Al),,[6],Al-TiAl-ZrL+Al3Ti(Al)L+Al3Zr(Al)TiZr[8]-,12814%Zn-Al102%K2ZrF63%K2TiF6,70076010mm,-111--Bridgman[9]©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(K2ZrF6650,K2TiF6600),10min,,()80mm/h-(K2ZrF680mm;K2TiF660mm),-200mm112-,,4%,,XL302TiZr,,,,,TiZrAl3TiAl3Zr[4-6],,,,,[10]:cos=LB-aBaL[10](1):();aL;aB;LB:GK=134r2KaL2-3cos+cos34[10](2):GK;rK(2),=0,GK=0,,(1a)),,,=180,(1c)),,0180,[10](1b)a)=0b)0180c)=1801,(2),,1,Si,,Si1Al3Ti(ZnSi)Al2ZrZn[6]Al5Ti2Zn,Al3TiAl3Zr,Zn,ZnAl[6]Al5Ti2Zn,3120031,:©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(SEM)1(,%)AlZnTiZrSi12371193701774614431652194291412218024124---2411511632105-Al3Ti,Al3Zr,Al5Ti2Zn,903,Al3TiAl,2a)b),,2c)Al3Ti,Al2ZrZn,Al5Ti2Zn(Al3Ti)[5]a)L(Al3Ti)b)Lc)phasegrowingd)L+3Al3TiTiZr,,[11],TiZr(TiZr0162%0166%),(Al3Ti)+L(Al)(Al3Zr)+L(Al)(Al)(Al3Ti),90,,,4b)(1),aB,,,,[12]Al3Ti,,,,,,4a)Al-Tia)b)4Al3TiAl-Zr[13],(ZrTi,Ti),TiZr(Al3Ti)5a):(Al3Ti)+L(Al),4120031©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.),Al3TiTiZr,,Ti,,Al3Ti,,,,,,,Al3Ti,,Al3Ti,[4-6]Al3TiAl5Ti2Zn,,,5c)443,(L+),5d),,,,a)L(Al3Ti)b)L+(Al3Ti)c)phasegrowingd)L+5Ti3,:[1]BeggA,CleggAJ.ProductionandEvaluationofsqueeze2castzinc2aluminum(ZA)alloys[J].TransactionsofAFS,1996,104:115921169.[2]YuHP,ZhangFQ,LIRD.Strengtheningandtougheningmech2anismofZA27:squeeze2castalloys[J].TransactionsofAFS,1997,105:6892692.[3]1ZA27[J]1,1988,(1):72111[4],1ZA27[J]1,1987,14(3):402451[5],,1TiZn-Al[J]1,1993,29(11):A48724901[6],1[J]1,1990,9(3):632701[7],,,1[J]1,2000,15(3):82111[8]1[M]1:,1989:26822691[9],,,1Bridgrman[J]1,1997,(4):412441[10]1[M]1:,1989,412421[11],,,1[J]1,2001,(4):6281[12]1[M]1:,19851802821[13],[M]1:,1987115921641[14],1[J]1,2000,(5):27-2915120031,:©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.