· For the Screw dislocation, the Burgers vector and the Line vector are parallel. · A straight screw dislocation creates a helical configuration for the planes normal to the dislocation line. The ...

the dislocations are straight edge type. For a pure twist boundary, an array of screw dislocations is required. From: Guy & Hren, "Elements of Physical Metallurgy," Addison Wesley (1974) · The ...