Abstract
The non-isothermal and isothermal crystallization kinetics of Zr72.5Al10Fe17.5 glassy alloy was investigated using differential scanning calorimeter (DSC). Under non-isothermal heating condition, the primary phase in the initial crystallization is Zr6Al2Fe phase and the final crystallized products consist of Zr6Al2Fe, Zr2Fe and a-Zr phases. The apparent activation energy for crystallization estimated using the Kissinger method is 342.1 ± 8.1 kJ/mol. The local activation energy decreased with the increase in the crystallization volume fraction during nonisothermal crystallization. Under isothermal heating condition, the average Avrami exponent of about 2.76 implies a mainly diffusion-controlled three-dimensional growth with an increasing nucleation rate. The local activation energy for isothermal crystallization shows a different variation trend from that for nonisothermal crystallization, indicating different nucleation-and-growth mechanisms for the two crystallizaiton conditions.
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Funded by the National Natural Science Foundation of China (No. 51401053), the China Postdoctoral Science Foundation (No.2015T80676), the Natural Science Foundation of Fujian Province (No.2014J05053), and the Postdoctoral Scientific Research Foundation of Fuzhou University (No.0180-601017)
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Hua, N., Chen, W., Liu, X. et al. Crystallization kinetics of a high-zirconium-based glassy alloy: A DSC study. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 31, 191–196 (2016). https://doi.org/10.1007/s11595-016-1351-6
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DOI: https://doi.org/10.1007/s11595-016-1351-6