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

• Published in: Journal of rare earths Vol. 29; no. 8; pp. 793 - 797
• Main Author: 庄艳歆 邢鹏飞 段同飞 史宏宇 赫冀成
• Format: Journal Article
• Language: English
• Published: Key Laboratory of Electromagnetic Processing of Materials of Ministry of Education, Northeastern University, Shenyang 110819, China%School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China 01.08.2011
• Subjects: 体积分数; 大块金属玻璃; 差示扫描量热; 活化能; 热稳定性; 结晶机制; 结晶行为; 非等温结晶动力学; Gd-based metallic glass; crystallization; activation energy; mechanism; non-isothermal; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(10)60544-3

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.