The high temperature deformation behavior and microstructure evolution of TC6 titanium alloy were investigated by Thermocmastor-Z100 kN thermal simulation testing machine under the conditions of deformation temperature of 900～945 ℃

strain rate of 0.000 1～0.1 s

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and deformation amount of 70%.The results indicate that with increasing in the deformation temperature

the transformation from primary α phase to β phase is more completed

and the strain rate has little effect on the content of primary α-phase. At low strain rate of 0.000 1 s

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and different deformation temperature conditions

the material fully undergoes dynamic recovery due to the overlongdeformation

which causes to grow and coarsen of the grain. The TC6 titanium alloy undergoes continuous dynamic recrystallization at a lower strain rate of 0.000 1～0.01 s

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while discontinuous dynamic recrystallization occurs at the strain rate of 0.1 s

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.In conclusion

the thermal deformation process parameters suitable for TC6 titanium alloy are presented as follows: deformation temperature of 915～945 ℃ and strain rate of 0.001～0.1 s

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.