Crystallization Kinetics of a High-zirconium-based Glassy Alloy:A DSC Study
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2016年第1期
论文作者：花能斌 CHEN Wenzhe LIU Xiaoli ZHANG Tao
文章页码：191 - 196
摘 要：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.
花能斌1,2，CHEN Wenzhe1,2，LIU Xiaoli2，ZHANG Tao3
1. Department of Materials Science and Engineering,Fuzhou University2. Department of Materials Science and Engineering,Fujian University of Technology3. Key Laboratory of Aerospace Materials and Performance (Ministry of Education),School of Materials Science and Engineering,Beihang University
摘 要：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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