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Cross
slip is the process by which a screw dislocation can move from one slip
plane to another. The diagram illustrates this for a dislocation loop in
an fcc crystal (a), with the loop initially on the (111) plane (green)
of the lattice. This plane intersects the (111) plane (yellow) along the
[101] direction and the screw component of the expanding loop (b) at z
can cross slip onto the (111) plane as shown in (c). The loop will continue
to expand on its new slip plane and as shown in (d) may again cross slip
to return to a plane parallel to its initial slip plane. A cross slip process
of this type can help a screw dislocation avoid a barrier on its initial
slip plane. |
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