Hot Deformation Behavior and Processing Maps of AA7085 Aluminum Alloy.

The flow behavior and processing maps of homogenized AA7085 aluminum alloy were investigated by isothermal hot compression tests in the temperature range of 300∼450 °C with strain rates of 0.01∼10 s −1 . Microstructure was characterized using Optical microscopy (OM), electron back-scattered diffraction (EBSD) and transmission electron microscopy (TEM). The results show that the superimposed processing maps at different strains exhibit the optimized deformation parameters with the temperature of 390∼450 °C and strain rates lower than 0.1 s −1 . Microstructure characterization reveals that dynamic recovery and recrystallization are the main deformation mechanisms in the safe regions. At lower temperature and lower strain rate, the coarsening of particles between ɛ=0.5 and ɛ=0.7 may be responsible for the transformation of processing map from unstability to safe domain. [ABSTRACT FROM AUTHOR]