Explain why slip in BCC is asymmetric on a given glide plane

Explain why slip in BCC is asymmetric on a given glide plane.

Solution

Asymmetric slip in b.c.c. metals is related to both the symmetry about  screw dislocations and elastic anisotropy. The elastic anisotropy differs quite substantially from one b.c.c. metal to the next and this anisotropy has been observed in measurements of asymmetric stresses.Because Slip in body-centered cubic (bcc) crystals occurs along the plane of shortest Burgers vector as well and however there are no truly close-packed planes in the bcc crystal structure