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乔吉超,Jean-Marc Pelletier,姚尧,葛渊.Zn38Mg12Ca32Yb18大块金属玻璃的晶化动力学行为[J].稀有金属材料与工程(英文),2019,48(5):1429~1434.[Qiao JiChao,Jean-Marc Pelletier,Yao Yao and Ge Yuan.Kinetic Analysis of Crystallization Behaviors in Zn38Mg12Ca32Yb18 Bulk Metallic Glass[J].Rare Metal Materials and Engineering,2019,48(5):1429~1434.]
Kinetic Analysis of Crystallization Behaviors in Zn38Mg12Ca32Yb18 Bulk Metallic Glass
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Received:December 20, 2017  Revised:February 02, 2018
DOI:
Key words: Metallic glass  Differential scanning calorimetry  Crystallization kinetics  Johnson-Mehl-Avrami (JMA) model  Avrami exponent
Foundation item:国家,国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Qiao JiChao,Jean-Marc Pelletier,Yao Yao and Ge Yuan  
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Abstract:
      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 indicated 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 were 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.