written 8.3 years ago by | • modified 2.9 years ago |
Mumbai University > Mechanical Engineering > Sem 4 > Material Technology
Marks: 5M
Year: May 2014
written 8.3 years ago by | • modified 2.9 years ago |
Mumbai University > Mechanical Engineering > Sem 4 > Material Technology
Marks: 5M
Year: May 2014
written 8.3 years ago by |
Crystal Defects Classification:
Excitons
Line defects
Point defects
The simplest point defects are as follows:
Line defects
Linear crystal defects are edge and screw dislocations.
Planar defects
Planar defect is an imperfection in form of a plane between uniform parts of the material. The most important planar defect is agrain boundary. Formation of a boundary between two grains may be imagined as a result of rotation of crystal lattice of one of them about a specific axis. Depending on the rotation axis direction, two ideal types of a grain boundary are possible: