AN IN-SITU STUDY OF PRISMATIC GLIDE IN ALPHA-TITANIUM AT LOW-TEMPERATURES

In situ experiments have been performed in two titanium ingots with di fferent purities in a view to studying the glide mechanism of a disloc ations in prismatic planes between 100 and 300 K. The observation of t he jerky movement of rectilinear screw dislocations leads to the concl usion that the strain rate is controlled by the locking-unlocking mech anism. Local stress measurements reproduce well the variation of the m acroscopic CRSS with temperature. The stress dependence of the locking -unlocking mechanism and the core structure of dislocations are discus sed.