简介:TheprecipitatingkineticsofNi75Al17Zn8alloywasstudiedatboth873Kand973Kbymicroscopicphase-fieldmodel.Thecalculationresultsshowthattheorder-disordertransformationexperiencesthematrix→lowly-orderedL10phase→L12phaseat973K.AndthenucleationofL12particlesbelongstothespinodaldecompositionmechanism.Astemperatureincreases,orderingsofAlandZnatomsareresisted,butcoarseningofL12particlesispromoted.Thevalueofcoarseningkineticexponentsapproachesto1/2.Inaddition,thediscussionsaboutNi-Alanti-sitedefectandZnsubstitutionsforNisiteandAlsiteexhibitthatthehigherthetemperature,themoredistinctivetheNi-Alanti-sitedefect,butthelesstheZnsubstitution.