Zn38Mg12Ca32Yb18大块金属玻璃的晶化动力学行为（英文）  

Kinetic Analysis of Crystallization Behaviors in Zn38Mg12Ca32Yb18 Bulk Metallic Glass

作　　者：乔吉超[1,2] Pelletier Jean-Marc 姚尧 葛渊[3] Qiao JiChao;Yao Yao;Ge Yuan(Northwestern Polytechnical University,Xi'an 710072,China;State Key Laboratory of Porous Metal Materials,Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China)

机构地区：[1]西北工业大学,陕西西安710072 [2]Universite de Lyon,MATEIS,UMR CNRS5510,Bat.B.Pascal,INSA-Lyon,F-69621 Villeurbanne Cedex,France [3]西北有色金属研究院金属多孔材料国家重点实验室,陕西西安710016

出　　处：《稀有金属材料与工程》2019年第5期1429-1434,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51611130120,11572249);the Natural Science Foundation of Shaanxi Province(2016JM5009)

摘　　要：采用差示扫描量热分析仪,研究了Zn38Mg12Ca32Yb18大块金属玻璃的在等时和等温状态下的晶化动力学行为。在等时条件下,不同的理论模型来分析特征温度的名义激活能。结果表明,采用Kissinger模型,Flynn-Wall-Ozawa模型和Augis-Bennett模型计算的名义激活能相互吻合。再者,采用Johnson-Mehl-Avrami模型分析了等温过程中晶化转变动力学机。Avrami指数n的分布区间介于3.25到4.12。分析发现,在等温晶化过程中采用Arrhenius方程计算得到的激活能比在等时晶化过中采用Kissinger方程的激活能要大,这可能是由于等温退火过程中能垒比等时晶化过程中的要高所引起的。The kinetics of crystallization of Zn38Mg12Ca32Yb18 bulk metallic glass was studied by differential scanning calorimetry (DSC) in both non-isothermal and isothermal (at different heating rates) modes.Under isochronal process,theoretical models were adopted to analyze the apparent activation energies for characteristic temperatures.The results indicate that the apparent activation energies for characteristic temperatures in the Zn38Mg12Ca32Yb18 bulk metallic glass by Kissinger model,Flynn-Wall-Ozawa (FWO) model and Augis-Bennett (AB) model are in good agreement with each other.Furthermore,crystallization transformation kinetics during isothermal process was analyzed by the Johnson-Mehl-Avrami (JMA) model.The Avrami exponent n ranges from 3.25 to 4.12 in the isothermal mode.It is noted that the activation energy corresponding to isothermal conditions calculated using Arrhenius equation is larger than the value calculated by the Kissinger method in isochronal conditions,because the energy barrier in isothermal annealing mode is higher than that of isochronal conditions.

关 键 词：金属玻璃 差示扫描量热分析仪 晶化动力学 Johnson-Mehl-Avrami模型 Avrami指数 

分 类 号：TG139.8[一般工业技术—材料科学与工程]