Effects of deformation parameters on microstructure of Ti60 titanium alloy

Effects of the deformation parameters on the microstructure of the Ti60 titanium alloy, including grain size and volume fraction of α phase were investigated using compression tests. Experiments were conducted on the material with (α+β) phases at deformation temperatures of 900, 930, 960 and 980°C, strain rates of 0.001, 0.01, 0.1, 1 and 10 s^-1, and height direction reductions of 50%, 60% and 70%. The results show that the deformation temperature has significant influence on microstructure of Ti60 titanium alloy. In two phases region, the volume fraction of α phase decreases with increase of deformation temperature, but the grain size increases first and then decreases with deformation temperature. The strain rate affects the morphology of α phase of Ti60 titanium alloy. With increase of strain rate, the grain size decreases first and then slightly increases, and the volume fraction of α phase decreases with increase of strain rate. The suitable height reduction makes grain size fine when it overtakes the threshold, and with increase of height direction reduction, the volume fraction of α phase increases first and then decreases.