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The microstructural evolution of the alloy Ti-6Al-4V was analyzed after hot compression tests in the temperature range of 800–1150°C and the strain rate range of 0.001 s −1  to 1 s −1 . The slope of work hardening and that of flow softening were conspicuously higher in the two-phase microstructure than those obtained in the single-phase β region. It was found that in the two-phase region the peak strain, the strain for highest rate of flow softening and the steady state strain were almost independent of the Zener–Hollomon parameter, Z. While in the single-phase region, characteristic strains were dependent on Z. The microstructural observations indicated that globularization in the α phase contributed to the flow softening. It was also shown that the kinetics of globularization decreased with strain rate. Otherwise, it was concluded that dynamic recrystallization comes into operation during hot deformation of the single-phase β microstructure. In the single-phase region the recrystallization softening and the average grain size diminished with strain rate and increased with temperature.

Microstructural evolution through hot working of the single-phase and two-phase Ti-6Al-4V alloy