· Screw Dislocations can participate in crystal growth by providing locations for atom addition that are self renewing. · A growth spiral due to a screw dislocation in Silicon Carbide are shown. 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 ...