PPT Slide
Therefore, the bcc metals obey the general rule that the slip direction is the close-packed direction, but they differ from mostly others metals by not having a definite single slip plane.
Slip in bcc metals is found to occur on the {110}, {112}, and {123} planes, while the slip direction is always the [111] direction.
There are 48 possible slip systems but since the planes are not so close-packed as in the fcc structure, higher shearing stresses are usually required to cause slip.