Determination of kinetic parameters from calorimetric study of solid state reactions in 7150 Al-Zn-Mg alloy
7150 Al-Zn-Mg合金固态反应动力学参数的测定(英文)作者机构:Department of Metallurgical and Materials Engineering National Institute of Technology Durgapur 713 209 India Materials Research Group School of Engineering Science University of Southampton Southampton SO 17 1B J UK
出 版 物:《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报(英文版))
年 卷 期:2011年第21卷第6期
页 面:1199-1209页
核心收录:
学科分类:08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)]
主 题:7150 Al-Zn-Mg alloy DSC aging behaviour activation energy transformation function
摘 要:Differential scanning calorimetric (DSC) study was carried out at different heating rates to examine the solid state reactions in a 7150 A1-Zn-Mg alloy in water-quenched (WQ) state, naturally and artificially aged tempers. The exothermic and endothermic peaks of the thermograms indicating the solid state reaction sequence were identified. The shift of peak temperatures to higher temperatures with increasing heating rates suggests that the solid state reactions are thermally activated and kinetically controlled. The artificial aging behaviour of the alloy was assessed by measuring the variations of hardness with aging time. The fraction of transformation (Y), the rate of transformation (dY/dt), the transformation functionflY), and the kinetic parameters such as activation energy (Q) and frequency factor (k0) of all the solid state reactions in the alloy were determined by analyzing the DSC data, i.e. heat flow involved with the corresponding DSC peaks. It was found that the kinetic parameters of the solid state reactions are in good agreement with the published data.