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1、Trans.NonferrousMet.Soc.China22(2012)577?584IsochronalandisothermalcrystallizationinZr55Cu30Ni5Al10bulkmetallicglassJ.C.QIAO,J.M.PELLETIERUniversitédeLyon,MATEIS,UMRCNRS5510,Bat.B.Pascal,INSA-Lyon,F-69621Villeurbannecedex,FranceReceived26August2011;acce
2、pted10December2011Abstract:Non-isothermalcrystallizationtransformationkineticsandisothermalcrystallizationkineticsinsuper-cooledliquidregion(SLR)inZr55Cu30Ni5Al10bulkmetallicglasseswerestudiedbydifferentialscanningcalorimetry(DSC)andX-raydiffraction(XRD
3、).Inisochronalmode,theaveragevaluesofactivationenergyinZr55Cu30Ni5Al10bulkmetallicglassdeterminedbydifferentmodels(Kissingermethod,Flynn-Wall-OzawamethodandAugis-Bennettmethod)areingoodagreementwitheachother.Inaddition,theisothermaltransformationkinetic
4、sinZr55Cu30Ni5Al10bulkmetallicglasseswasdescribedbytheJohnson-Mehl-Avrami(JMA)model.ForZr55Cu30Ni5Al10bulkmetallicglass,theAvramiexponentnrangesfrom2.2to2.9,indicatingthatcrystallizationmechanisminthebulkmetallicglasswasmainlydiffusion-controlled;crysta
5、lgrowthiscontrolledbylongrangeorderingdiffusioninthree-dimensionalgrowthduringisothermalcrystallizationprocess.TheaveragevalueofactivationenergyinZr55Cu30Ni5Al10bulkmetallicglassis469kJ/molinisothermaltransformationprocess.Keywords:Zr55Cu30Ni5Al10;metal
6、licglass;thermalanalysis;crystallizationkinetics;Avramiexponentresults,especiallythekineticsofthisevolution.Itiswell1Introductionknownthatthekineticsofcrystallizationinamorphousmaterialsissensitivetothekineticparameters,whichUnlikethecrystallizedcounter
7、parts,bulkmetallicmainlyincludetheactivationenergyofcrystallization,glasseslackoflong-rangeorderintheatomicassembly.mechanismsofnucleationandgrowthprocessforbulkTherefore,metallicglassespossessuniquecombinationmetallicglasses,natureofcrystallinephases,o
8、fstructuralandfunctionalproperties,suchashighcrystallizationtimeandtemperature.ROYandstrength,largeelasticity,lowelasticmodulusandRAGHUVANSHI[12]analyzedtheisothermalandexcellentcorrosionresistance[1?11].Thus,bulknon-isothermalcr
