Abstract
Studies were performed on high purity titanium using positron annihilation measurement (PA) and hardness measurement (HD) to evaluate defects as a function of various deformation and annealing treatments. Results reveal the following: (1) at low deformation vacancy-type defects are readily produced and become saturated while dislocation-related defects increase almost linearly with increasing deformation, (2) peak temperature for recovery and recrystallization are 150--200 C and 450--500 C, respectively, and (3) PA was most sensitive to the annealing in the recovery stage while HD was most sensitive in the recrystallization stage.
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