Crystallization Kinetics of Mischmetal-based Bulky Amorphous Alloy （Metallic Glasses ）

Si Yi~ 1; 2; Meng Likai~1; Zhao Wei~1; Suo Zhongyuan~1

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Crystallization Kinetics of Mischmetal-based Bulky Amorphous Alloy （Metallic Glasses ）
Issue 9, Pages: 544-547(2006)
Published： 2006 ，
DOI：

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[1]司颐,孟力凯,赵威,索忠源,武晓峰.混合稀土基大块非晶合金晶化动力学的研究[J].特种铸造及有色合金,2006(09):544-547+532.

Si Yi~ 1, 2, Meng Likai~1, et al. Crystallization Kinetics of Mischmetal-based Bulky Amorphous Alloy （Metallic Glasses ）. [J]. Special Casting & Nonferrous Alloys (9):544-547(2006)
[1]司颐,孟力凯,赵威,索忠源,武晓峰.混合稀土基大块非晶合金晶化动力学的研究[J].特种铸造及有色合金,2006(09):544-547+532. DOI：

Si Yi~ 1, 2, Meng Likai~1, et al. Crystallization Kinetics of Mischmetal-based Bulky Amorphous Alloy （Metallic Glasses ）. [J]. Special Casting & Nonferrous Alloys (9):544-547(2006) DOI：

摘要

通过示差扫描量热法（DSC）研究了混合稀土基MM55Al25Cu10Ni5Co5大块非晶合金的晶化动力学。结果表明:该非晶合金晶化具有明显的动力学效应;阶段激活能随晶化体积分数的增加

先迅速增加

达到最大值后缓慢下降

为典型的形核及长大机制

且形核瞬间完成

晶化以生长为主。各种表观激活能都大于单一稀土基La55Al25Cu10Ni5Co5非晶合金相应的值

表明前者比后者具有更高的热稳定性。区域Avrami指数n（x）为3.22

.23

为三维形核与长大过程。晶化以形核率增加还是减小的方式进行

取决于晶化体积分数与晶化温度。

Abstract

Crystallization kinetics of mischmetal-based bulk metallic glasses MM

55 Al

25 Cu

10 Ni

has been analyzed by differential scanning calorimetry （DSC）. The results indicate that the crystallization behavior of the metallic glasses exhibit obvious kinetic effects. The local activation energy is rapidly increased to a peak value firstly

and then is gradually decreased with increasing in crystallized volume fraction

which is typical nucleation and growth mechanism

where nucleation is completed instantaneous and growth is dominant in crystallization. The apparent activation energies of the MM-based metallic glasses are superior to those of the La

55 Al

25 Cu

10 Ni

metallic glasses

showing higher thermal stability. Local Avrami exponents are calculated to be in the range of 3.22 to 5.23

which is a 3D nucleation and growth process. Crystallization transformation behavior is dependent on crystallized volume fraction and crystallized temperature.