Vadodara Institute Of Engineering
Name: Chaturvedi Anupam
Milan Patel
Shinde Abhishek
Topic : Slip
Teacher : Sahil Shah
Division : Mechanical 3
Sem : 3rd
Slip:
• Dislocation motion, or called slip leads to
plastic deformation.
• Edge dislocation, the dislocation line moves in
the direction of applied shear stress.
• Screw dislocation, the dislocation line moves
towards the direction perpendicular to shear
stress.
Slip:
Slip:
• Dislocations move on a certain
crystallographic plane: slip plane
• Dislocations move in a certain crystallographic
direction: slip direction
• The combination of slip direction and slip
plane is called a slip system
• Slip planes are normally close-packed planes
• Slip directions are normally close-packed
directions
Slip Systems:
Crystal
system
Slip plane Slip
direction
Active
slip
systems
<110>
Total
number of
slip
systems
12
fcc
{111}
hcp
{0001}
<2110>
3
2/3
bcc
{110}
{100}
<111>
48
2
5
Slip Systems:
• F.C.C. metal has 4 sets of (1 1 1) planes and 3
close packed directions in each plane
therefore, the number of Slip systems is 12.
• Therefore these metals show higher ductility.
• The slip lines in B.C.C metals are wavy and
irregular.
• Therefore these metals show a less plastic
deformation.
Slip Systems:
• H.C.P metals doesn’t have a number of slip
planes.
• Therefore these metal shows intermediate
plasticity.
Motions Of Slip:
• Slip occurs due to motion of dislocation.
• These motions are of 2 types:
1. Glide
2. Climb
Glide:
• In this motion, dislocation moves in a plane
where it is generated.
• It occurs because of the following reasons:
1. Migration of line defect.
2. Analogy of migration through a carpet.
3. Cold-working and creation of tangles.
4. Glide System.
Climb:
• In this motion, dislocation moves out of the
original plane.
• It depends on temperature because of
dependence of its following characteristics:
1. Equilibrium Point
2. Super Saturation
3. Mobility of Point defects.