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.