Kinetics study on non-isothermal crystallization of the metallic Co 43Fe20Ta5.5B31.5 glass

doi:10.1016/j.jallcom.2005.06.022

	Kinetics study on non-isothermal crystallization of the metallic Co 43Fe20Ta5.5B31.5 glass
	Yuan, Zi-Zhou; Chen, Xue-Ding; Wang, Bing-Xia; Wang, Ying-Jun
刊名	Journal of Alloys and Compounds
	2006-01-05
卷号	407 期号:1-2 页码:163-169
关键词	Activation energy Amorphous materials Cobalt compounds Crystallization Differential scanning calorimetry Heating Nucleation Rapid solidification Thermoanalysis Kinetics Steeper Transition metal alloy
ISSN号	09258388
DOI	10.1016/j.jallcom.2005.06.022
英文摘要	The crystallization kinetics of metallic Co43Fe 20Ta5.5B31.5 glass has been studied by continuous heating differential scanning calorimetry. The DSC traces have been analyzed in terms of activation energy and kinetic model. It is found that all the DSC traces have a single exothermic peak which is asymmetrical, with a steeper leading edge and a long high temperature tail. The heating rate has a significant influence on the shape of the DSC curve, activation energy and transformation mechanism. The existence of a critical heating rate, βcrit = 20 K min-1, is evident. The activation energy for crystallization are determined as 594.8 and 581.4 KJ mol-1 for the heating rates β = 5-20 K min-1, and 437.7 and 432 KJ mol-1 for the heating rates β = 25-65 K min-1, when using the Kissinger equation and the Ozawa equation, respectively. For the volume fraction crystallized, α, Ec dependence was obtained by the general Ozawa's isoconversional method. Using the Surin˜ach curve fitting procedure, the kinetics was specified. Namely, the crystallization begins with the Johnson-Mehl-Avrami nucleation-and-growth mode and the mode which has been well described by the normal grain growth kinetic law. These two modes are mutually independent. The proportion between the JMA-like and the NGG-like modes is related to the heating rate. The JMA kinetics is manifested as a rule in the early stages of the crystallization. The JMA exponent, n, initially being larger than 4 and continuously decreases to 1.5 along with the development of crystallization. The NGG-like mode dominates in the advanced stages of the transformation with the NGG exponent, m = 0.5 and is the major and principal kinetic characteristics for heating rate, β > 25 K min -1. © 2005 Elsevier B.V. All rights reserved.
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000234613600026
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/111967]
专题	材料科学与工程学院土木工程学院
作者单位	State Key Laboratory of Advanced Non-Ferrous Materials, Lanzhou University of Technology, 287 Langongping Road, Lanzhou 730050, China
推荐引用方式 GB/T 7714	Yuan, Zi-Zhou,Chen, Xue-Ding,Wang, Bing-Xia,et al. Kinetics study on non-isothermal crystallization of the metallic Co 43Fe20Ta5.5B31.5 glass[J]. Journal of Alloys and Compounds,2006,407(1-2):163-169.
APA	Yuan, Zi-Zhou,Chen, Xue-Ding,Wang, Bing-Xia,&Wang, Ying-Jun.(2006).Kinetics study on non-isothermal crystallization of the metallic Co 43Fe20Ta5.5B31.5 glass.Journal of Alloys and Compounds,407(1-2),163-169.
MLA	Yuan, Zi-Zhou,et al."Kinetics study on non-isothermal crystallization of the metallic Co 43Fe20Ta5.5B31.5 glass".Journal of Alloys and Compounds 407.1-2(2006):163-169.