Hot Deformation Microstructure and Mechanism of Ti53311S Titanium Alloy

The hot deformation behavior of Ti53311S titanium alloy in the temperature range of 880–1080 °C and strain rate range of 0.001-10 s−1 have been studied by hot compressive testing on a Gleeble-1500 simulator. The flow behavior was described by the hyperbolic sine constitutive equation, the activation energies in (α+β) region and in β region were calculated as 641 kJ/mol and 244 kJ/mol, respectively. The microstructure of Ti53311S was observed and analyzed using an optical microscope. The experimental results show that this alloy is sensitive to deformation temperature and strain rate, and the strain rate sensitivity exponent values (m) decreases with increasing of deformation temperature while the deformation activation energy (Q) increases. The leading deformation mechanism in the single phase β region is dynamic recover, while that in (α+β) region is grain boundary slipping and grain globularizing.