Investigation of recrystallization kinetics of AA5005 sheets after rolling by thermal analysis

In this study, the non-isothermal crystallization kinetics of cold rolled AA5005 aluminum alloy sheets obtained from ASAŞ Aluminum in Akyazı-Sakarya was studied by using thermal analysis. The thermal analysis of cold rolled samples from AA5005 aluminum alloy sheets were performed by differential scanning calorimetry (DSC) with different heating rates (10–15–20–25°C/min). The non – isothermal recrystallization kinetics of samples was performed by using Kissenger, Boswell, Ozawa and Starink equations. These are model – free methods. Using derivative scanning calorimetry data at different heating rates (β), recrystallization temperatures were deduced and activation energies were calculated from the slopes from Y–1/T diagrams. Y is ln(β/T2) for Kissenger, ln(β/T) for Boswell, ln(β) for Ozawa and ln(β/T1.92) for Starink. The kinetics results showed that the activation energy of recrystallization for 33% deformed AA5005 sheet is in the range of 147–158 kJ/mol and this value for 74,7% deformed AA5005 is in the range of 194–206 kJ/mol, according to four non-isothermal kinetics model. Keywords: AA5005 Aluminum alloy, recrystallization, non-isothermal kinetics