A differential scanning calorimetric investigation of precipitation kinetics in the Al-1.53 wt% Cu-0.79 wt% Mg alloy

Jena, A. K.; Gupta, Archana; Chaturvedi, M.C.

doi:10.1016/0001-6160(89)90015-1

Cited by 129 publications

(102 citation statements)

References 19 publications

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“…[1,3,9,12,15,20,24,[29][30][31][32][33]46,47] Figure 7 shows the computed storage modulus compared to the experimental data for a test series on AA 2024-T3 at excitation frequencies of 100, 30, 10, 3, and 1 Hz. Figure 7 shows also the evolution of GPZ and h¢/S¢ concentration with temperature.…”

Section: E Results For Aa 2024-t3mentioning

confidence: 99%

“…For instance, assuming that the particular phase transformation is a temperature-or thermally-activated process, the concentration of the species may follow the Arrhenius behavior. In this case, the transformation rate equation is [15,18] …”

Section: Modeling Of Phase Transformation Kinetics Of Alznmg and Alcumentioning

confidence: 99%

“…Jena et al [15] stated that precipitation reactions that occur by nucleation and growth yield sigmoidal behavior and are best described either by the Avrami model in Eq. [1], or by Eq.…”

Section: Modeling Of Phase Transformation Kinetics Of Alznmg and Alcumentioning

confidence: 99%

“…First, we considered the GPZ dissolution a thermally activated process following Arrhenius behavior, as stated by Jena [15,18] ; that is,…”

Section: B Modeling Of Transformation Reaction Ratesmentioning

confidence: 99%

“…For the alloys of the family AlCuMg, it is widely accepted that the age-hardening mechanism is based on two different aging sequences, which depend on the Cu:Mg ratio [3,[12][13][14][15][16] :…”

Section: Introductionmentioning

confidence: 99%

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Modeling of the Effect of Temperature, Frequency, and Phase Transformations on the Viscoelastic Properties of AA 7075-T6 and AA 2024-T3 Aluminum Alloys

Rojas

Crespo

2012

Metall Mater Trans A

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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 analytical 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 precipitates (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 several 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.

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Section: E Results For Aa 2024-t3mentioning

confidence: 99%

Section: Modeling Of Phase Transformation Kinetics Of Alznmg and Alcumentioning

confidence: 99%

“…Jena et al [15] stated that precipitation reactions that occur by nucleation and growth yield sigmoidal behavior and are best described either by the Avrami model in Eq. [1], or by Eq.…”

Section: Modeling Of Phase Transformation Kinetics Of Alznmg and Alcumentioning

confidence: 99%

“…First, we considered the GPZ dissolution a thermally activated process following Arrhenius behavior, as stated by Jena [15,18] ; that is,…”

Section: B Modeling Of Transformation Reaction Ratesmentioning

confidence: 99%