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

摘要: Abstract Heat effects characteristic of the precipitation process in as-quenched Al-1.53 wt% Cu-0.79 Mg alloy were calculated from DSC thermograms obtained suitably designed experiments. peaks due to GPB zones, dissolution zones-dislocation complexes, formation S′ phase and identified. Values for fractional transformation, Y, rate (dY/dt), using relations specially developed each process. Expressions kinetics processes formulated which enabled calculation activation energies, Q∗, frequency factors, k0, function ƒ(Y) kinetic equation ( d Y/ t) = ƒ(Y)k 0 exp (−Q∗/RT ). The measured parameters consistent with available data expected mechanisms some transformations.