Abstract
The hot forming process is a proven technique to enable complex shaped components to be manufactured from 7xxx aluminum alloy. However, a suitable forming process window for 7xxx aluminum alloy has not been yet established. In this work, the inherent workability based on the implementation of hot processing maps for AA7075-H18 alloy sheet under hot forming conditions was systematically studied. The hot processing maps were established based on the thermal plastic flow data and an improved Johnson-Cook constitutive model. Safety (T > 350 ℃) and unstable zones were identified. The power dissipation coefficient η increases with the decrease of strain rate in safety zones, which indicates that the softening mechanism of AA7075 alloy gradually changes from dynamic recovery to dynamic recrystallization.
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