Hot Working Property Study of 7055 Aluminum Alloy Based on Hot Shear-Compression Deformation

To fill the gap in the study of hot working properties of materials under complex stress and strain states, novel shear compression specimens were introduced to study the hot deformation behavior of 7055 aluminum alloy through the Gleeble-3500 thermal simulation machine. The flow curves were obtained using the Mises equivalent equation, and the processing maps were made. In addition, the microstructures after deformation were analyzed with OM and EBSD techniques. The results showed that the effect of shear-compression deformation was mainly at the oblique slots of the specimen, where the peak stress was 1.5 times that in the uniaxial compression test at 450 °C-0.01 s⁻¹. The stress rose to the peak and then continued to fall with strain, while the steady-state flow phenomenon only appeared at high temperatures and low rates. The processing maps showed that the desired hot working area was at 450 °C-5 s⁻¹, and the organization analysis supports this result. It was found that higher temperatures would significantly increase the uniformity of organization in the narrow gap region. Higher strain rates would promote dynamic recrystallization (DRX) nucleation at high temperatures and effectively discourage DRX grain growth.