S.
NO
|
Edge dislocation
|
Screw dislocation
|
1
|
These dislocations arise due to
introduction or elimination of an
extra row of atoms.
|
A screw dislocation provides for easy
crystal growth because additional
atoms and unit cells can be added to
step of the screw.
|
2
|
Tensile, compressive and shear stress
fields may be present.
|
Only shear stress field exists.
|
3
|
Region of lattice disturbance
extends along an dislocation line.
|
Region of lattice disturbance extends
in two separate planes at right angles
to each other.
|
4
|
Burger’s vector is always perpendicular
to the dislocation line
|
Burger’s vector is parallel to the
dislocation line.
|
5
|
These dislocation are formed during
deformation and during crystallisation.
|
These dislocations are also formed
during deformation and during
crystallisation.
|
6
|
An edge dislocation (pure) can glide
and climb
|
A screw dislocation can glide only.
|
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