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1、第35卷 第1期金属学报Vol.35No.11999年1月ACTAMETALLURGICASINICAJanuary1999应用调制差示扫描量热计(Modulated-DSC)3分离非晶态合金的玻璃化转变吕昭平 李 毅(DepartmentofMaterialsScience,NationalUniversityofSingapore,Singapore119260)黄思峻 冯元平(DepartmentofPhysics,NationalUniversityofSingapore,Singapo
2、re119260)卢 柯(中国科学院金属研究所快速凝固非平衡合金国家重点实验室,沈阳110015)摘 要 应用调制差示扫描量热计对非晶态合金La55Al25Ni10Cu10,Mg65Zn35,Nd60Fe30Al10以及Zr30Y30Al15Ni25的玻璃化转变过程进行了研究.在Mg65Zn35和Nd60Fe30Al10合金中观察到了玻璃化转变;在Mg65Zn35,Nd60Fe30Al10以及Zr30Y30Al15Ni25中甚至观察到两个玻璃化转变过程.由于能够清楚地观察到玻璃化转变过程,因此可
3、以得到更加精确的约化玻璃化转变温度(玻璃化转变温度/熔点).关键词 调制差示扫描量热计,非晶态合金,玻璃化转变中图法分类号 TG115.25,TG139文献标识码 A 文章编号 0412-1961(1999)01-0073-77STUDYOFGLASSTRANSITIONANDCRYSTALLIZATIONINFOURMETALLICGLASSESUSINGTEMPERATUREMODULAT2EDDSCLüZhaoping(Z.P.L),LIYi(Y.Li)DepartmentofMate
4、rialsScience,NationalUniversityofSingapore,Singapore119260NGSerChoon(S.C.Ng),FENGYuanping(Y.P.Feng)DepartmentofPhysics,NationalUniversityofSingapore,Singapore119260LUKeStateKeyLaboratoryforRSA,InstituteofMetalResearch,TheChineseAcademyofSciences,Shen
5、yang110015Correspondent:DrLIYi,seniorlecturer,Tel:(65)8743348,Fax:(65)7763604,E-mail:masliy@nus.edu.sgManuscriptreceived1998-03-18,inrevisedform1998-06-04ABSTRACTGlasstransitionbehaviourofsomemetallicglassescannotbestudiedandobservedbycon2ventionalDS
6、Cduethefactthattheyarecloselyfollowedbycrystallization.However,thenewlydevelopedtemperaturemodulatedDSCcanseparatethesetwotransformations.Fourmetallicglasses,La55Al25Ni10Cu10,Mg65Zn35,Nd60Fe30Al10andZr30Y30Al15Ni25,havebeenstudiedbyatemperaturemodula
7、teddiffer2entialscanningcalorimetry(MDSC).ItisclearlydemonstratedthattheglasstransitioncanbeseparatedfromcrystallizationbytheMDSC.TwoglasstransitionshavebeenobservedforMg65Zn35,Nd60Fe30Al10andZr30Y30Al15Ni25.Duetoclearerobservationofglasstransition,t
8、hecalculationofreducedglasstemper2atureTrgcannowbeobtainedwithgreaterconfidence.KEYWORDSModulatedDSC,metallicglass,glasstransition[1] 差示扫描量热计(DSC)已经广泛地应用于材料测量相加热或等温中进行.总热流量的变化可以用下式表述变过程中的热量和温度变化.差热分析过程一般是在恒定dH/dt=-Cβp+f(T,t)(1)式中,H代表总热流量(W/g),Cp是试样热
