PPT Slide
(2). The inherent lattice resistance to dislocation motion can be related to two geometrical parameters of the slip plane, the atomic smoothness of the plane and the distance separating the adjacent planes.
Smooth, widely separated planes offer considerably lower resistance to dislocation motion (atoms in adjacent planes sliding over one another) than do closely spaced, “rough” planes.
The planes of densest atomic packing are those with the smoothest atomic structure and are also spaced further apart than any other set of crystallographic planes.
Slip planes for the various crystal structures are given in Table 13-1.