Plastic Deformation

· Screw dislocations can "cross slip" onto another slip plane of the system when the resolved shear stress on that system is above the stress required for dislocation motion.
· For unit dislocations cross slip is not strongly dependent on temperature.

From: Barrett, Nix & Tetelman, Prentice Hall (1973)

· The dissociation into partial dislocations restricts screw motion to the plane of the stacking fault. Cross slip requires that the partial dislocations re-associate, cross slip as a unit dislocation, and then re-dissociate on the new slip plane. Thermal fluctuations in the lattice aid the re-association and cross slip will be temperature dependent.