Modeling of the effect of temperature, frequency, and phase transformations on the viscoelastic properties of AA 7075-T6 and AA 2024-T3 Aluminum Alloys
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hdl:2117/18490
Tipus de documentArticle
Data publicació2012-12-01
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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.
CitacióRojas, J.; Crespo, D. Modeling of the effect of temperature, frequency, and phase transformations on the viscoelastic properties of AA 7075-T6 and AA 2024-T3 Aluminum Alloys. "Metallurgical and materials transactions A-Physical metallurgy and material", 01 Desembre 2012, vol. 43, p. 4633-4646.
ISSN1073-5623
Versió de l'editorhttp://link.springer.com/article/10.1007%2Fs11661-012-1281-7
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