Prismatic and basal slip in Ti3Al I. Frictional forces on dislocations

Publisher Website
Google Scholar
Abstract
In situ straining experiments have been conducted in polycrystalline Ti3Al, with the aim of analysing the mechanisms controlling dislocation motion and interpreting themechanical properties. This first part is devoted to the glide process of 1/3 〈1120〉 dislocations in prismatic and basal planes. Antiphase boundary (APB) energies have been measured in these planes. Two different APB energies and two different frictional forces have been observed in parallel prismatic planes, corresponding probably to two different cutting planes. The high Peierls-type frictional forces which have been observed in the basal and in one type of prismatic plane are shown to originate from non-planar dislocation cores, in agreement with recent atomistic calculations.