Permanent deformation in BCC crystals occurs on the most closely packed planes, and it happens in the most closely packed directions that are {110} planes and <111> directions in the BCC crystal. Assume that a force is applied to a BCC crystal that permanently deforms it in the [001] direction. For permanent deformation that is on a (011) plane:
a) What is the angle between the normal to the (011) plane and the [001] direction?
(b) Atomic displacements along what most closely packed directions could contribute to permanent deformation of the crystal in the [001] direction?
(b) On the (011) plane the <111> type directions that could contribute to deformation in the [001] direction are the [111] and the [111].
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