(see Figure 2.8), slip only occurs along some of them. These are the planes with
the closest packing of atoms. Consider Figure 2.9 in which the ease of slip
along a close-packed plane can be compared with that along a less closely-
packed plane. If layer A is to be slid over layer B then a measure of the ease of
sliding is the gradient line drawn on each figure. The close-packed plane
involves a lower gradient than the less closely-packed plane and so appears to
be more easily slid.
Figure 2.10 shows the hexagonal close-packed structure. It has just a single
slip plane though there are three directions in which slip ca ...
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