Correlation of data on the hot deformation of Ti-6Al-4V

Published data on the hot deformation of Ti-6Al-4V alloy were correlated by the Zener-Hollomon relation. Within the temperature range of 700 to 1000? C, for which the alloy is two phase, two mechanisms are operable. The one associated with lower temperature-strain-rate combinations has an activation energy of about 85 000 cal mol^?1, which is considerably greater than any reported experimental activation energy for self diffusion in titanium. Thus, mechanisms other than dislocation climb must be considered. An apparent activation energy of 172 000 cal mol^?1 was found for higher temperature-strain-rate combinations and is felt to be related to the occurrence of dynamic recrystallization.