Crystallization kinetics in Cu46Zr45Al7Y2 bulk metallic glass by differential scanning calorimetry (DSC)

被引：111

作者：

Qiao, J. C. ^{[1
]}

Pelletier, J. M. ^{[1
]}

机构：

[1] Univ Lyon, MATEIS, UMR CNRS5510, INSA Lyon, F-69621 Villeurbanne, France

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2011年 / 357卷 / 14期

关键词：

Metallic glass; Cu46Zr45Al7Y2; Crystallization kinetics; Kissinger and Johnson-Mehl-Avrami methods; Activation energy; SUPERCOOLED LIQUID REGION; ISOTHERMAL CRYSTALLIZATION; THERMAL-STABILITY; FORMING ABILITY; NONISOTHERMAL CRYSTALLIZATION; ISOCHRONAL CRYSTALLIZATION; AMORPHOUS-ALLOYS; MATRIX COMPOSITE; ZR-TI; BEHAVIOR;

D O I：

10.1016/j.jnoncrysol.2010.12.071

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Crystallization transformation kinetics in isothermal and non-isothermal (continuous heating) modes were investigated in Cu46Zr45Al7Y2 bulk metallic glass by differential scanning calorimetry (DSC). In isochronal heating process, activation energy for crystallization at different crystallized volume fraction is analyzed by Kissinger method. Average value for crystallization in Cu46Zr45Al7Y2 bulk metallic glass is 361 kJ/mol in isochronal process. Isothermal transformation kinetics was described by the Johnson-Mehl-Avrami (JMA) model. Avrami exponent n ranges from 2.4 to 2.8. The average value, around 2.5, indicates that crystallization mechanism is mainly three-dimensional diffusion-controlled. Activation energy is 484 kJ/mol in isothermal transformation for Cu46Zr45Al7Y2 bulk metallic glass. These different results were discussed using kinetic models. In addition, average activation energy of Cu46Zr45Al7Y2 bulk metallic glass calculated using Arrhenius equation is larger than the value calculated by the Kissinger method in non-isothermal conditions. The reason lies in the nucleation determinant in the non-isothermal mode, since crystallization begins at low temperature. Moreover, both nucleation and growth are involved with the same significance during isothermal crystallization. Therefore, the energy barrier in isothermal annealing mode is higher than that of isochronal conditions. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：2590 / 2594

页数：5

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