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A differential scanning calorimetric investigation of precipitation kinetics in the Al-1.53 wt% Cu-0.79 wt% Mg alloy by A.K. Jena; A.K. Gupta; M.C. Chaturvedi is a Engineering article available to read on EtoBox.

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Heat effects characteristic of the precipitation process in the as-quenched AI-l.53 wt% Cu-O.79 wt% Mg alloy were calculated from DSC thermograms obtained from suitably designed experiments. DSC peaks due to precipitation of GPB zones, dissolution of GPB zones, dissolution of GPB zones-dislocation complexes, formation of the S' phase and dissolution of the S' phase were identified. Values for the fractional transformation, Y, and the rate of transformation, (d Y/d?), were calculated using relations specially developed for each process. Expressions for the kinetics of the processes were formulated which enabled the calculation of activation energies, Q \*, frequency factors, $, and the function, f( Y) of the kinetic equation (d Y/dt) =J( Y)k,, exp( -Q \*/RT). The measured kinetic parameters were consistent with the available data and expected mechanisms of some of the transformations. R&sum&Les caracteristiques des effets thermiques de la precipitation dans un alliage d'aluminium a 1,53% en poids de cuivre et 0,79% en poids de magnesium, brut de trempe, ont tti calculees a partir des thermogrammes de calorimetric en balayage differentiel (CBD) au tours d'experiences bien adaptees a

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Author

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

Publisher

Elsevier Science; Elsevier ; University of Toronto Press; Elsevier BV (ISSN 0001-6160)

Published

1989

Language

EN

Field

Engineering (Physical Sciences)