DSC study of the kinetic parameters of the metastable phases formation during non-isothermal annealing of an Al–Si–Mg alloy

被引：0
作者：
Mourad Ibrahim Daoudi
Abdelhafid Triki
Abdelkrim Redjaimia
机构：
[1] University of Guelma Algeria and LM2S Laboratory,Physics Department
[2] University of Annaba and LM2S Laboratory,Physics Department
[3] Institut Jean Lamour,undefined
[4] Ecole des Mines de Nancy,undefined
来源：
Journal of Thermal Analysis and Calorimetry | 2011年 / 104卷
关键词：
Al–Si–Mg alloy; DSC; Kinetic parameters; Isoconversional methods;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Kinetics of β″ and β′ precipitations in an AlSiMg have been studied under non-isothermal conditions using differential scanning calorimetry (DSC) technique. The variation of the activation energy as a function of transformed fraction is determined using two isoconversional methods of Kissinger–Akahira–Sunose (KAS) and Friedman. The results obtained using the two methods show a change in the activation energy for both metastable phases precipitations as a function of transformed fraction. The results obtained from KAS method as compared with those obtained from Friedman method, show some major disagreements between the two methods. The growth exponent, determined by Ozawa method, decreases as a function of temperature for both phases.
引用
收藏
页码：627 / 633
页数：6
相关论文
共 117 条
  • [1] Kempen ATW(2002)Determination and interpretation of isothermal and non-isothermal transformation kinetics; the effective activation energies in terms of nucleation and growth J Mater Sci 37 1321-1332
  • [2] Sommer F(1964)Kinetics of thermal degradation of char-forming plastics from thermogravimetry. Application to a phenolic plastic J Polym Sci C 6 183-195
  • [3] Mittemeijer EJ(1964)Kinetic parameters from thermogravimetric data Nature 201 68-69
  • [4] Friedman HL(1957)Reaction kinetics in differential thermal analysis Anal Chem 29 1702-1706
  • [5] Coats AW(1971)Trans. Joint Convention of Four Electrical Institutes, Paper No. 246, 1969 Research report. Chiba Institute of Technology Sci Technol 16 22-31
  • [6] Redfern JP(1992)Analysis of the kinetics of phase transformations J Mater Sci 27 3977-3987
  • [7] Kissinger HE(2001)Modification of the integral isoconversional method to account for variation in the activation energy J Comput Chem 22 178-183
  • [8] Akahira T(2009)A new iterative linear integral isoconversional method for the determination of the activation energy varying with the conversion degree J Comput Chem 30 1986-1991
  • [9] Sunose T(2008)A simple and precise linear integral method for isoconversional data Thermochim Acta 474 81-86
  • [10] Mittemeijer EJ(1974)On the occurence oft he metastable phase β″ in Al–Si–Mg alloy Phys Stat Sol A 24 607-612
12345678910