Question

dislocations which occurs in crystalline materials are known as
- point defect
-line defect
-volume defects
-surface defect

Answer 1

the answer is it's line defect.i hope it would help you.

Answer 2

option (b). Line defect is the correct option.

• Dislocations that occur in crystalline materials are known as Line defect
• Line defects are called dislocations and occur in crystalline materials only.
• Dislocations are especially important in materials science because they help determine the mechanical strength of materials.
• There are two basic types of dislocations, edge dislocation, and screw dislocation.
• A dislocation or Taylor's dislocation is a linear crystallographic defect or irregularity within a crystal structure that contains an abrupt change in the arrangement of atoms.
• The movement of dislocations allows atoms to slide over each other at low-stress levels and is known as glide or slip.
• The crystalline order is restored on either side of a glide dislocation but the atoms on one side have moved by one position.
• The crystalline order is not fully restored with a partial dislocation.
• A dislocation defines the boundary between slipped and unslipped regions of material and as a result, must either form a complete loop, intersect other dislocations or defects, or extend to the edges of the crystal.

Hence, option (b). Line defect is the correct option.

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