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Limitation of the Johnson-Mehl-Avrami equation for the kinetic analysis of crystallization in a Ti-based amorphous alloy

Limitation of the Johnson-Mehl-Avrami equation for the kinetic analysis of crystallization in a Ti-based amorphous alloy
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摘要 The primary crystallization of the Ti40Zr25NisCu9Bc18 amorphous alloy was studied by isochronal differential scanning calorimetry （DSC）. The activation energy was determined by the Kissinger-Akahim-Sunose method. Trying to analyze the crystallization kinetics of the Ti40Zr25NigCu9Be18 amorphous alloy by two different methods, it was found that the crystallization kinetics did not obey the Johnson-Mehl-Avrami equation. A modified method in consideration of the impingement effect was proposed to perform kinetic analysis of the isochronal crystallization of this alloy. The kinetic parameters were then obtained by the linear fitting method based on the modified kinetic equation. The results show that the isochronal crystallization kinetics of the amorphous Ti40Zr25Ni8CugBe18 alloy is heating rate dependent, and the discrepancy between the Johnson-Mehl-Avrami method and the modified method increases with the increase of heating rate. The primary crystallization of the Ti40Zr25NisCu9Bc18 amorphous alloy was studied by isochronal differential scanning calorimetry （DSC）. The activation energy was determined by the Kissinger-Akahim-Sunose method. Trying to analyze the crystallization kinetics of the Ti40Zr25NigCu9Be18 amorphous alloy by two different methods, it was found that the crystallization kinetics did not obey the Johnson-Mehl-Avrami equation. A modified method in consideration of the impingement effect was proposed to perform kinetic analysis of the isochronal crystallization of this alloy. The kinetic parameters were then obtained by the linear fitting method based on the modified kinetic equation. The results show that the isochronal crystallization kinetics of the amorphous Ti40Zr25Ni8CugBe18 alloy is heating rate dependent, and the discrepancy between the Johnson-Mehl-Avrami method and the modified method increases with the increase of heating rate.
作者 Jun Wang Hong-chao Kou Hui Chang Xiao-feng Gu Jin-s han Li Hong Zhong Lian Zhou
机构地区 State Key Laboratory of Solidification Processing School of Information Technology
出处 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2010年第3期307-311,共5页 矿物冶金与材料学报（英文版）
基金 supported by the National Natural Science Foundation of China (No50601011) the National Basic Research Priorities Program of China (No2007CB607603) the State Key Laboratory of Solidification Processing in NWPU (NoSKLSP200905) the Program for New Century Excellent Talents in Chinese Universities (NoNCET-06-0484)
关键词 amorphous alloys CRYSTALLIZATION KINETICS Johnson-Mehl-Avrami equation IMPINGEMENT amorphous alloys crystallization kinetics Johnson-Mehl-Avrami equation impingement
分类号 O631.1 [理学—高分子化学] O631.13 [理学—高分子化学]
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参考文献22

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International Journal of Minerals,Metallurgy and Materials
2010年 第3期

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