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

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