Question

Write down the four difference between edge and screw dislocation

Answer 1

Edge dislocation implies that one of the atoms in a unit cell is missing or supplanted or included as an addition that shouldn't be there. The area of the error is on one of the edges of the three-dimensional structure that the unit cell takes as a shape.

The error isn't in the face (amidst one of the sides) or the focal point of that structure.Usually, an edge dislocation is a confined peculiarity (error), and the structure is ordinary every which way far from that error, albeit likely wound or twisted at the point of error.

A screw dislocation happens for comparative reason (a blunder in atom arrangement), yet as opposed to staying restricted, the error causes the encompassing structures to stay distorted off one way, with the error moving down the structure in a winding as the crystal stone tries to come back to its ordinary example yet can't on the grounds that the error has distorted the quick space around the mistake, and that proceeds with the error.

Answer 2

A dislocation in materials science refers to a crystallographic defect within a crystal structure. Edge dislocation and screw dislocation are the two primary types of dislocations.

Edge dislocation

1. This type of dislocation arises due to the introduction or elimination of an extra row of atoms.

2. Tensile, compressive and shear stress fields can be present.

3. The region of lattice disturbance extends along a dislocation line.

4. Always the Burger's vector is perpendicular to the dislocation line.

Screw dislocation

1. Additional atoms and unit cells can be added to step of the screw. So it provides for easy crystal growth.

2. Only the shear stress field exists.

3. The region of lattice disturbance extends in two separate planes at right angles to each other.

4. Burger's vector is parallel to the dislocation line.