Kinetics study on non-isothermal crystallization of amorphous alloy Mg 65Cu15Ag10Y10

doi:10.4028/www.scientific.net/AMR.413.432

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	Kinetics study on non-isothermal crystallization of amorphous alloy Mg 65Cu15Ag10Y10
	Wang, Xiao-Jun 2; Xia, Tian-Dong 1; Chen, Xue-Ding 2
	2012
会议日期	January 7, 2012 - January 8, 2012
会议地点	Xi'an, China
关键词	Activation energy Alloys Amorphous alloys Amorphous materials Curve fitting Differential scanning calorimetry Heating Heating rate Isothermal annealing Kinetics Materials science Rapid solidification Silver alloys Thermoanalysis Average values Continuous heating DSC DSC curves Fitting procedure Iso-conversional method Kinetics studies Kissinger equation Local activation energies Mutually independents Nonisothermal crystallization Ozawa equation
卷号	413
DOI	10.4028/www.scientific.net/AMR.413.432
页码	432-438
英文摘要	The crystallization kinetics of amorphous alloy Mg65Cu 15Ag10Y10 has been studied by differential scanning calorimetry in the mode of continuous heating annealing. It is found that both DSC curves and activation energy show a strong dependence on the heating rate. The activation energy for crystallization are determined as 186.1 and 184.4 KJ mol-1 for the heating rates β=5-20 Kmin -1, and 107.5 and 110.0 KJmol-1 for the heating rates β=20-80Kmin-1, when using the Kissinger equation and the Ozawa equation, respectively. Local activation energy at any volume fraction crystallized was obtained by the general Ozawa's isoconversional method. The average value of local activation energy for heating rates ranging from 5 to 20Kmin-1 is 180.9 KJ mol-1 and for heating rates ranging between 20 and 80Kmin-1 is 110.2 KJ mol-1. Using the Surin˜ach curve fitting procedure, the kinetics mode was specified. 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 about 2 along with the development of crystallization. The NGG-like mode dominates in the advanced stages of the transformation. These two modes are mutually independent. The proportion between the JMA-like and the NGG-like modes is related to the heating rate.
会议录	Advanced Materials Research
会议录出版者	Trans Tech Publications, P.O. Box 1254, Clausthal-Zellerfeld, D-38670, Germany
语种	英语
ISSN号	10226680
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/116004]
专题	兰州理工大学
作者单位	1.Key Lab. of Non-ferrous Metal Alloys, Ministry of Education, Lanzhou Univ. of Tech., Lanzhou 730050, China 2.State Key Lab. of Gansu Advanced Non-ferrous Metal Materials, Lanzhou Univ. of Tech., Lanzhou 730050, China;
推荐引用方式 GB/T 7714	Wang, Xiao-Jun,Xia, Tian-Dong,Chen, Xue-Ding. Kinetics study on non-isothermal crystallization of amorphous alloy Mg 65Cu15Ag10Y10[C]. 见:. Xi'an, China. January 7, 2012 - January 8, 2012.