Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 22    No. 3    March 2012

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Isochronal and isothermal crystallization in
Zr55Cu30Ni5 Al10 bulk metallic glass
J. C. QIAO, J. M. PELLETIER

Université de Lyon, MATEIS, UMR CNRS5510, Bat. B. Pascal, INSA-Lyon,
F-69621 Villeurbanne cedex, France

Abstract:Non-isothermal crystallization transformation kinetics and isothermal crystallization kinetics in super-cooled liquid region (SLR) in Zr55Cu30Ni5Al10 bulk metallic glasses were studied by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). In isochronal mode, the average values of activation energy in Zr55Cu30Ni5Al10 bulk metallic glass determined by different models (Kissinger method, Flynn-Wall-Ozawa method and Augis-Bennett method) are in good agreement with each other. In addition, the isothermal transformation kinetics in Zr55Cu30Ni5Al10 bulk metallic glasses was described by the Johnson-Mehl-Avrami (JMA) model. For Zr55Cu30Ni5Al10 bulk metallic glass, the Avrami exponent n ranges from 2.2 to 2.9, indicating that crystallization mechanism in the bulk metallic glass was mainly diffusion-controlled; crystal growth is controlled by long range ordering diffusion in three-dimensional growth during isothermal crystallization process. The average value of activation energy in Zr55Cu30Ni5Al10 bulk metallic glass is 469 kJ/mol in isothermal transformation process.

 

Key words: Zr55Cu30Ni5Al10; metallic glass; thermal analysis; crystallization kinetics; Avrami exponent

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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