3D processing map and hot deformation behavior of 6A02 aluminum alloy

The high-temperature flow behavior of 6A02 aluminum alloy was studied through hot compressive experiments. Based on the experimental data, the values of strain rate sensitivity, efficiency of power dissipation and the instability parameter under the condition of various hot working parameters were investigated. Processing maps were established by superimposing the instability map over the power dissipation map, this being connected with microstructural evolution analysis in the hot deformation processes. It was found that flow stress grows with increases in the strain rate and with decreases in the deformation temperature. The studied alloy isn't suitable to be processed at temperatures exceeding 490 degrees C or under strain rates which are too low, when intending to acquire uniform fine recrystallization structure. The processing map with a strain of 0.6 is divided into four characterization regions for researching microstructure evolution. The optimum hot working domains are the areas of 450-470 degrees C/0.1-1 s(-1) and 430-450 degrees C/0.01-0.1 s(-1). (c) 2018 Elsevier B.V. All rights reserved.