power point presentation on " climb and cross slip of dislocation"

1. CLIMB AND CROSS SLIP OF
DISLOCATION
ABHIJEET KUMAR
2016PGMMMT04
NIT JAMSHEDPUR

2. WHAT IS SLIP?
THERE ARE TWO BASIC TYPES OF DISLOCATION MOVEMENT
1. GLIDE OR CONSERVATIVE
2. CLIMB OR NON CONSERVATIVE

3. SLIP IN CRYSTALS
• Slip occurs in densely and closed packed crystals
• Lower shear stress/energy are required for slip to occur in densely
packed planes
CLOSED PACKED PLANE
NON CLOSED PACKED PLANE

4. SLIP SYSTEM
It consist of the following:
1. Slip direction
2. Slip plane
Determining Active Slip
System
1. Brute Force Method
2. Elegant Method

5. CROSS SLIP
• In fcc metals, the screw dislocation move in {111} types plane , but
can switch from {111} type plane to another if it contains the
direction of ‘b’ . This process is known as cross slip. (Ref:-Hull and
Bacon)

6. CLIMB
• In this motion, dislocation moves out of the original
plane.
• Climb is a diffusion dominated process.
• It depends on temperature because of dependence of its
following characteristic.
Equilibrium Point
Super Saturation
Mobility of Point defects.

7. CLIMB

8. WHAT ARE THE IMPLICATIONS OF CLIMB
• It is a short length of the dislocation
not lying in the same plane as the main
plane but having the same Burger
vector.
• Jogs are steps on a dislocation that
move it from one atomic plane to
another
• There is also another type of
dislocation step called a kink.
• Kinks are steps that displace the
dislocation within the slip plane.

9. THANK YOU!!