Title:
|
Modeling of the effect of temperature, frequency, and phase transformations on the viscoelastic properties of AA 7075-T6 and AA 2024-T3 Aluminum Alloys
|
Author:
|
Rojas Gregorio, José Ignacio; Crespo Artiaga, Daniel
|
Other authors:
|
Escola d'Enginyeria de Telecomunicació i Aeroespacial de Castelldefels; Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials |
Abstract:
|
The viscoelastic response of commercial aluminum alloys 7075-T6 and 2024-T3 as a function of
temperature is presented. Experimental data are obtained with a dynamic-mechanical analyzer
(DMA) at different loading frequencies and compared with the available transmission electron
microscopy (TEM) and differential scanning calorimetry (DSC) data. The effect of successive
microstructural transformations (particle precipitation and redissolution) is revealed. An ana-
lytical model is developed, which fits the mechanical response up to 573 K (300
C). The model
takes into account the concentration of Guinier-Preston Zones (GPZ) and metastable precipi-
tates (
g
¢
in AA 7075-T6 and
h
¢
/S
¢
in AA 2024-T3), allowing us to determine the kinetic
parameters of these transformations. The activation energies were previously obtained by sev-
eral authors from DSC measurements and other techniques, showing considerable dispersion.
The presented data, obtained with a completely different technique, allow us to reduce the
uncertainty on these data and show the potential of DMA measurements in the study of
microstructural transformations. |
Abstract:
|
Peer Reviewed |
Subject(s):
|
-Àrees temàtiques de la UPC::Enginyeria dels materials -Viscoelastic materials -Aluminum alloys--Heat treatment -Viscoelasticitat -- Materials -Alumini -- Aliatges -- Propietats termomecàniques |
Rights:
|
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
|
Article - Published version Article |
Share:
|
|