Determination of kinetic parameters from calorimetric study of solid state reactions in 7150 Al-Zn-Mg alloy
Determination of kinetic parameters from calorimetric study of solid state reactions in 7150 Al-Zn-Mg alloy
Differential scanning calorimetric (DSC) study was carried out at different heating rates to examine the solid state
reactions in a 7150 Al-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 function f(Y), 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.
7150 al-zn-mg alloy, dsc, aging behaviour, activation energy, transformation function
1199-1209
Ghosh,, K.S.
e217e28d-10d5-4c49-9ea5-b51e9f79fa66
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
June 2011
Ghosh,, K.S.
e217e28d-10d5-4c49-9ea5-b51e9f79fa66
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Ghosh,, K.S. and Gao, N.
(2011)
Determination of kinetic parameters from calorimetric study of solid state reactions in 7150 Al-Zn-Mg alloy.
Transactions of Nonferrous Metals Society of China, 21 (6), .
(doi:10.1016/S1003-6326(11)60843-1).
Abstract
Differential scanning calorimetric (DSC) study was carried out at different heating rates to examine the solid state
reactions in a 7150 Al-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 function f(Y), 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.
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Published date: June 2011
Keywords:
7150 al-zn-mg alloy, dsc, aging behaviour, activation energy, transformation function
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 196023
URI: http://eprints.soton.ac.uk/id/eprint/196023
ISSN: 1003-6326
PURE UUID: 7e655723-0380-47b9-8f86-ce5f8dc49c7c
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Date deposited: 01 Sep 2011 10:08
Last modified: 15 Mar 2024 03:10
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Author:
K.S. Ghosh,
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