Effect of pre-annealing on thermal stability of amorphous Zr-Cu-Ni alloy  

作　　者：LIUYan HUIXidong WANGHuanrong 

机构地区：[1]DepartmentofMaterialsScienceandEngineering,ShandongInstituteofArchitectureandEngineering,Jinan250014,China [2]StateKeyLaboratoryforAdvancedMetalsandMaterials,UniversityofScienceandTechnologyBeijing,Beijing100083,China [3]KeyLaboratoryofLiquidStructureandHeredityofMaterials,MinistryofEducation,ShandongUniversity,Jinan250061,China

出　　处：《Rare Metals》2003年第4期270-275,共6页稀有金属（英文版）

基　　金：This work is financially supported by the National Natural Science Foundation of China (No.59871025 and 50171006),Hi-tech Research;Development Program of China(863)(No.2001AA331010);National Major Basic Research Project of China(973)(No.G2000 6720

摘　　要：The influence of pre-annealing on thermal stability of the amorphousZr_(70)Cu_(20)Ni_(10) alloy was reported by employing the differential scanning calorimetry (DSC)and high-resolution transmission electron microscopy (HRTEM) techniques. It has been observed thatthe supercooled liquid region decreases with increasing the annealing time under isothermalconditions, indicating that the thermal stability of the amorphous Zr_(70)Cu_(20)Ni_(10) alloydecreases gradually. HRTEM observations reveal that there exist some ordered atomic clusters in theamorphous matrix at the relaxation stage. These ordered atomic clusters can be regarded asprecursors for the precipitation of the crystalline phases in the subsequent crystal-lizationprocess. The reasons resulting in the decrease in thermal stability of the amorphousZr_(70)Cu_(20)Ni_(10) alloy with annealing time are discussed through the Gaussian decomposition forthe radial distribution function of the amorphous Zr_(70)Cu_(20)Ni_(10) alloy.The influence of pre-annealing on thermal stability of the amorphousZr_(70)Cu_(20)Ni_(10) alloy was reported by employing the differential scanning calorimetry (DSC)and high-resolution transmission electron microscopy (HRTEM) techniques. It has been observed thatthe supercooled liquid region decreases with increasing the annealing time under isothermalconditions, indicating that the thermal stability of the amorphous Zr_(70)Cu_(20)Ni_(10) alloydecreases gradually. HRTEM observations reveal that there exist some ordered atomic clusters in theamorphous matrix at the relaxation stage. These ordered atomic clusters can be regarded asprecursors for the precipitation of the crystalline phases in the subsequent crystal-lizationprocess. The reasons resulting in the decrease in thermal stability of the amorphousZr_(70)Cu_(20)Ni_(10) alloy with annealing time are discussed through the Gaussian decomposition forthe radial distribution function of the amorphous Zr_(70)Cu_(20)Ni_(10) alloy.

关 键 词：PRE-ANNEALING thermal stability amorphous alloy Gaussian decomposition DSC HRTEM 

分 类 号：TG132.33[一般工业技术—材料科学与工程] TG115.21[金属学及工艺—合金]