Dynamic recrystallization behavior of TB-13 titanium alloy

Microstructure characteristic and dynamic recrystallization behavior of TB-13 titanium alloy during hot rolling were studied. The microstructure changes after 32%, 50%, 59% and 75% hot rolling reductions were observed by means of optical microscope (OM) and transmission electron microscope (TEM). The results show that the dynamic recrystallization mechanism of TB-13 titanium alloy is continuous dynamic recrystallization during hot rolling. When the deformation reduction is 32%, the characteristic of microstructure indicates that platy of original β grains which are elongated along hot rolling direction existed. The boundary of grain is straight and there are a quantity of random dislocations and dislocation patterns. With the increase of hot rolling deformation, the sub-grains form in the boundary of grains, and the dislocations aggregate in the boundaries of sub-grains make the angle of sub-grain boundary increased. The fine dynamic recrystallization grains are formed by the low angle grain boundary transforming into big angle grain boundary finally.