Non-Schmid stresses, i.e., stresses that do not drive the motion of dislocations, are known to impact the core morphology of $\langle a\rangle$-type screw dislocations in $\alpha$-Ti. In this study, the interaction of the dislocation core with non-Schmid stresses is quantitatively modeled by an elastic dipole tensor characterizing the displacement field of the dislocation core. Density functional theory is used to compute the elastic dipole tensor of screw dislocations during a pyramidal and prism slip and a cross slip from a pyramidal to a prism plane. The effect of non-Schmid stress on the mobility of dislocations is discussed and the model is used to assess the properties of oriented single crystals.

Close

PrevNext

View figure in article

• Defects
• Disclinations & dislocations
• Line defects
• Mechanical deformation