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The hot deformation behavior of Ti-44Al,Ti-44Al-6Nb and Ti-44Al-6Nb-1Cr-2V alloys was studied on a Gleeble-1500D hot simulation machine at the temperature range of 1 100 ～ 1 250 ℃ and 0. 01 s~(-1). The results show that Ti-44Al-6Nb-1Cr-2V alloy shows the lower peak stress comparing to Ti-44Al alloy and Ti-44Al-6Nb alloy under the same deformation condition indicating that beta phase stabilizing elements can reduce flow stress of TiAl alloys significantly. The lamellar is bending and elongation to coordinate deformation during hot deformation,and dynamic recrystallization is mainly occurred at the lamellar colony. The dynamic recrystallization increases with the increase of the deformation temperature and beta phase stabilizing element content. B2 phase coordination deformation and promoting dynamic recrystallization are the main softening mechanism for TiAl alloys at high temperature. Thus addition of beta phase stabilizing elements and controlling of B2 phase can effectively improve the hot workability of TiAl alloys.