PPT Slide
In the last four lectures, we dealt with point defects (e.g. vacancy, interstitials, etc.) and line defects (dislocations).
There is another class of defects called interfacial or planar defects:
- They occupy an area or surface and are therefore bidimensional.
- They are of great importance in mechanical metallurgy.
Examples of these form of defects include:
- grain boundaries
- twin boundaries
- anti-phase boundaries
- free surface of materials
Of all these, the grain boundaries are the most important from the mechanical properties point of view.