Hot deformation behavior and processing map of 6069 aluminum alloy

The thermal compaction testing on 6069 aluminum alloy was carried out in the temperature range of 300~450 ℃ and the strain rate range of 0.01~10 s-1 on Gleeble-1500 hot-simulation machine.The hot deformation behavior and hot workability of the alloy were studied and constitutive equation and processing map were established.The results show that the flow behavior of 6069 aluminum alloy can be described by the hyperbolic sine function and the activation energy is about 289.36 kJ/mol in the present experimental condition.The processing map established at the true strain of 0.7 shows that there are two safe deformation zones of hot deformation for the alloy,including the zone in the deformation temperature range of 300~350 ℃ and the strain rate range of 1~10 s-1,and other zone in the deformation temperature range of 380~450 ℃ and strain rate range of 0.01~0.3 s-1.The deformation temperature of 350 ℃ and deformation rate of 0.01 s-1 are the best hot deformation condition.