Question

Which type of dislocation has the Burgers vector parallel to the dislocation line?

• A. Edge
• B. Screw
• C. Mixed
• D. Partial

Hint:

Remember: In a screw dislocation, the Burgers vector is parallel to the dislocation line; in an edge dislocation, it is perpendicular.

Answer 1

The Correct Option is B

Dislocations are linear defects in crystals, and the Burgers vector represents the magnitude and direction of lattice distortion.
In a screw dislocation, the Burgers vector is parallel to the dislocation line. This means that the direction of atomic displacement is in the same direction as the dislocation itself.
In contrast:
- For an edge dislocation, the Burgers vector is perpendicular to the dislocation line.
- A mixed dislocation has components of both edge and screw, so the Burgers vector is neither completely parallel nor completely perpendicular.
- Partial dislocations describe a different concept related to stacking faults and are not defined purely by directionality.
Therefore, the screw dislocation is the correct answer.