2D and 3D Defects

Lesson 4 of 10 • 2 upvotes • 8:01mins

Akhildev V P

Discussed about various 2D and 3D defects in the crystals. Types of 2D defects are a) External surfaces b) Grain boundaries c) Twin boundaries and d) stacking fault. External surface type defects occur due to free bonds in the material. This is a defect because, basically the atoms doesn't have the type of bonding with its supposed to be where in the bulk. Grain boundary type defects arises due to region of mismatch in Crystal's grain structure. That is if there is change in orientation of the particles, this type of defects arises. It will be of two kinds, low angle and high angle grain boundary defects. The next is the twin boundary defects, occurs due to pair of mismatch in materials. They were exist in pairs. The last one is defect due to missing of stacking sequence,known as stacking fault. Then the volume defects were described, they are Pores, Foreign inclusions, cracks etc.