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Kinetic study on the non-isothermal crystallization of Gd53Al24Co20Zr3 bulk metallic glass

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文摘 Gd-based bulk metallic glass has drawn strong attention because of its large magnetic entropy changes.Thermal stability of metallic glass is a very important issue for its application.In the paper,crystallization behavior of Gd53Al24Co20Zr3 bulk metallic glass was investigated using non-isothermal differential scanning calorimetric(DSC)technique.Attention was given to the analytic details.The crystallized volume fractions as a function of temperature were derived from the DSC signals,where heat capacity change between amorphous phase and crystalline phase was considered.The local activation energies at different crystallized volume fraction were estimated using Doyle-Ozawa and Agrawal methods.The results suggested that the Doyle-Ozawa equation was appropriate to get local activation energy due to its simplicity and accuracy.The local activation energy depended on the crystallized volume fraction.Function reflecting crystallization mechanism was also deduced.The crystallization mechanism of the Gd-based bulk metallic glass was discussed.
来源 Journal of Rare Earths ,2011,29(8):793-797 【核心库】
DOI 10.1016/s1002-0721(10)60544-3
关键词 Gd-based metallic glass ; crystallization ; non-isothermal ; activation energy ; mechanism ; rare earths
地址

1. Northeastern University, Key Laboratory of Electromagnetic Processing of Materials of Ministry of Education, Shenyang, 110819  

2. School of Materials and Metallurgy,Northeastern University, Shenyang, 110819

语种 英文
文献类型 研究性论文
ISSN 1002-0721
学科 冶金工业
基金 Fundamental Research Funds for the Central University
文献收藏号 CSCD:4331022

参考文献 共 24 共2页

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