铝硅镁合金三元相图

本文主要内容是阐述铝硅镁合金三元相图的英文文献

JPEDAV(2007)28:189–191

DOI:10.1007/s11669-007-9027-81547-7037ÓASMInternational

PhaseDiagramEvaluations:SectionII

Al-Mg-Si(Aluminum-Magnesium-Silicon)

V.Raghavan

Thecompilationoftheexperimentaldataonthisternarysystemby[1995Vil]includesaliquidusprojectionand15verticalsectionsfrom[1977Sch]andpartialisothermalsectionsat1050,800,460,430,427,400,and300°Cfromseveralsources.Subsequenttothethermodynamicassess-mentofthissystemby[1992Cha],newassessmentswerereportedby[1997Feu,2005Lac].

compoundMg2Si(C1,CaF2-typecubic),withnegligibleterminalsolidsolubility.[2000Yan]developedanewthermodynamicdescriptionoftheMg-Sisystemthatusesfewermodelparametersthan[1997Feu].Morerecently,[2004Kev]remodeledtheMg-Sidescriptiontoobtainaphasediagramwithoutanarti cialmiscibilitygapintheliquidphaseathightemperatures,asfoundinthedescrip-tionsof[1997Feu,2000Yan].

BinarySystems

TheAl-Mgphasediagram[2003Cze]hasthefollowingintermediatephases:Mg2Al3(cubic,denotedb),Rore(rhombohedral)andMg17Al12(A12-typecubic,denotedc).TheAl-Siphasediagramisasimpleeutecticsystemwiththeeutecticat577°Cand12.2at.%Si.

IntheMg-Sisystem,[1997Feu]performedcalorimetricstudiestodeterminetheenthalpiesofformationandfusion,andtheheatcapacityofMg2SiandtheenthalpyofmixingofliquidMg-Sialloys.ThenewexperimentalresultswereusedintheoptimizationoftheMg-Siphasediagrambycomputation.Thediagramdepictsastoichiometric

TernaryPhaseEquilibria

Withstartingmetalsof99.999%Al,99.98%Mgand99.999%Si,[1997Feu]induction-meltedalloysamplesunderAratm.Differentialthermalanalysis(DTA)wasdoneatheating/coolingratesbetween2and5°ingthenewdatawiththoseintheliterature(asselectedby[1992Cha]),[1997Feu]reoptimizedthethermodynamicparameters.Theliquid,theface-centeredcubic(fcc)andtheclose-packedhexagonal(cph)phasesweremodeledassingle-latticesubstitutionalsolutions.TheAl-Mgcom-pounds,Mg2SiandSiweretreatedasstoichiometricphases.Ternaryinteractionparametersweredeterminedfortheliquidphase.TheearlierdescriptionoftheAl-Mgphasediagram[1990Sau],whichincludesanuncon rmedcom-poundf,wasused.This,however,didnotchangethecomputedresultsintheAl-richregion.InFig.1-4,thefourverticalsectionsat95,90,85and80mass%Al

respectively

Fig.1Al-Mg-Sicomputedverticalsectionat95mass%Al

[1997Feu]Fig.2Al-Mg-Sicomputedverticalsectionat90mass%Al[1997Feu]

JournalofPhaseEquilibriaandDiffusionVol.28No.22007189

本文主要内容是阐述铝硅镁合金三元相图的英文文献

SectionII:PhaseDiagramEvaluations

computedby[1997Feu]arecomparedwiththeirownDTAdataonsolidi cationtemperatures.Theagreementwiththeexperimentaldataisgood.

[2005Lac]carriedoutanewthermodynamicassessmentofthissystem,whichusestherevisedAl-Mgdescriptionwithonlythethreeintermediatephases,Mg2Al3(b),eandc.Theyusedalargersetofdatafortheliquid-solidequilibriafromtheexperimentalresultsof[1977Sch,1997Feu].Temperature-independentternaryinteractionparameterswereobtainedfortheliquidphase.Apartialliquidusprojectionandthreeverticalsectionsat5and85mass%Aland2mass%Sirespectivelywerecomputedby[2005Lac].Theverticalsectionat2mass%SiisredrawninFig.5.Theagreementwiththeexperimentalresultsof[1977Sch,1931Los]issatisfactory.

Theeutecticmaximum(e3)ofthereactionL$ðAlÞþMg2SidoesnotlieontheAl-Mg2SijoinbutontheMg-richsideofthisline[1992Cha,1997Feu,2001Bar,2005Lac].ThepartialliquidusprojectioninFig.6depictstheaboveunivariantlinedeterminedby[2001Bar].Otherrecentreferencesonthephaseequilibriaofthissysteminclude[1999Esk,2002Fro,2003Erm,2003Roo,2004Liu,2005Don].

Fig.5Al-Mg-Sicomputedverticalsectionat2mass%Si

[2005Lac]

Fig.3Al-Mg-Sicomputedverticalsectionat85mass%Al

[1997Feu]

Fig.6Al-Mg-Sipartialliquidusprojectiondepictingtheuni-variantlineofL$ðAlÞþMg2Si[2001Bar]

References

1931Los:L.Losana,TheAluminum-Magnesium-SiliconTernarySystem,Metall.Italiana,1931,23,p367-382,inItalian

1977Sch:E.SchurmannandA.Fischer,MeltingEquilibriaintheTernarySystemAl-Mg-Si,Giessereiforschung,1977,29(4),p161-165,in

German

Fig.4Al-Mg-Sicomputedverticalsectionat80mass%Al

[1997Feu]

190JournalofPhaseEquilibriaandDiffusionVol.28No.22007

本文主要内容是阐述铝硅镁合金三元相图的英文文献

PhaseDiagramEvaluations:SectionII

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JournalofPhaseEquilibriaandDiffusionVol.28No.22007191

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