Which one of the following statements is true? Please explaineach choice: why it is true/false.
(a) The Burgers vector of an edge dislocation is normal to thedislocation line and normal to the slip plane.
(b) The Burgers vector of a screw dislocation is normal to thedislocation line and parallel to the slip plane.
(c) When a screw dislocation enables slip in a single crystal,the dislocation line remains in the slip plane.
(d) BCC crystals do not contain dislocations.
(e) Fine-grained samples of γ-iron contain fewer dislocationsthan coarse-grained samples of γ-iron.
