Processing Maps for Controlling Microstructure of an Aircraft 2E12 Aluminum Alloy

The deformation behavior and microstructure evolution in a hot compressed 2E12 alloy was investigated by constructing power dissipation map in which work efficiency can be related with microstructure evolution.Compression tests were performed in the temperature range of 250-500 °C and the strain rate ranging from 0.01 s-1 to 10 s-1 up to a true strain of 0.5.The processing maps reveal that two domains where dynamic recovery occurs comparatively:(1) 325-400 °C and 0.01-0.03 s-1,(2) 350-450 °C and 1.78-10 s-1,and partial dynamic recrystallization occurs at T≥450 °C.However,there also is evidence of redissolution of the particles and intercrystalline cracks at 500 °C and 1-10 s-1.It is shown that the volume of partial recrystallization increase with increasing of deformation temperature.