Edge dislocation is faster than Screw dislocation due to
associated shear stress (distortion) in case of Screw
dislocation.
Berger
vector indicates the direction of dislocation w.r.to slip
plane. it is perpendicular to dislocation
line in case of edge dislocation and parallel to dislocation line in
Screw dislocation.
Helix or Spiral
structure is formed in case of screw dislocation and shear stress is associated with
atoms adjacent to dislocation region. This consumes more energy in
compare to edge dislocation. it means less energy is required in
edge dislocation than screw dislocation. Hence, edge dislocation is
faster than screw disloaction.
