Effects of crystallization on low-temperature specific heat capacity of Cu60Zr20Hf10Ti10 bulk metallic glass

来源期刊:中国有色金属学报(英文版)2011年第6期

论文作者:王志新 孙斌 卢金斌

文章页码:1309 - 1313

关键词:Cu60Zr20Hf10Ti10块体金属玻璃;比热;晶化

Key words:Cu60Zr20Hf10Ti10 BMG; specific heat capacity; crystallization

摘    要:测量Cu60Zr20Hf10Ti10块体金属玻璃和其晶化态合金在2~101 K的比热,研究晶化过程对块体金属玻璃比热的影响。讨论晶化过程对Cu60Zr20Hf10Ti10块体金属玻璃低温比热和块体金属玻璃的波色峰的影响。结果表明:这两种合金的比热都与单一的德拜模型不相符,都存在着局域谐振模型(爱因斯坦模型)。分别用一个德拜模型和两个爱因斯坦模型拟合玻璃态合金,用一个德拜模型和一个爱因斯坦模型拟合晶化态合金,拟合结果与实验数据吻合得很好。

Abstract:

The specific heat capacities of Cu60Zr20Hf10Ti10 bulk metallic glass (BMG) and crystallized alloys were measured from 2 to 101 K. The effect of crystallization on the specific heat capacity of the BMG was studied. The effects of crystallization and the relationship between local modes and boson peak in the BMG were discussed. The specific heat capacity deviates from the simple Debye behaviors, showing the presence of local harmonic modes (Einstein oscillator) in the BMG and the crystallized alloy. Model calculation includes the contribution of one Debye mode and two Einstein modes for the BMG, one Debye mode and one Einstein mode for the crystallized alloy, showing an adequate description of the experimental data.

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