Thermal analysis techniques remain important tools amongst the large variety of methods used for analysis of the precipitation and dissolution of the Guinier-Preston zone and metastable phase θ in Al-3wt% Cu. In the present study, the kinetics of precipitation and dissolution of the Guinier-Preston zone and metastable phase θ in Al-3wt% Cu was investigated using differential scanning calorimetry carried out between room temperature and 430• C at heating rates of 20, 25, and 30The activation energies evaluated through isothermal differential scanning calorimetry treatment using the Johnson-Mehl-Avrami theory were 25, 100, and 80 kJ mol for the Guinier-Preston zone precipitation, formation of θ /θ and dissolution of θ , respectively. The Avrami constant n obtained by the Ligero method was about 1.5 for the formation of θ /θ indicating that bulk nucleation is dominant in θ /θ formation controlled by diffusion from a constant number of nuclei.
The kinetic parameters such as activation energy E and the growth morphology parameters n and m were determined by a non-isothermal method. The microstructure variations of the precipitation and dissolution of GP zone and metastable phase θ in Al-3wt.% Cu were analyzed by optical microscopy and X-ray diffraction. The kinetics of GP zone and metastable phase θ in Al-3wt.% Cu was investigated using differential thermal analysis between room temperature and 430 • C at heating rates of 20, 25 and 30 • Cmin −1. The activation energies of GP zone precipitation, formation of θ /θ and dissolution of θ were 26, 105 and 77 kJmol −1 , respectively. The growth morphology parameters n (Avrami parameter which indicates the crystallization mode) and m (a numerical factor which depends on the dimensionality of crystal growth) are both about 1.5.
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