There are sources and sinks of vacancies in the crystal. Free surfaces, grain boundaries and edge dislocations all act as both sources and sinks of vacancies. If an atom from a regular site join these defects they act as source of vacancy.The vacancy concentration increases. If an atom from these sites leave an fill a nearby vacancy they act as sinks of vacancy. Vacancy concentration decreases.
which surface has more energy among these Free surface ,Grain boundary & Twin boundary
free surface
Thanku sir for sharing your knowledge with us
sir vacancy concentration.. how it changes
didnt understood
There are sources and sinks of vacancies in the crystal. Free surfaces, grain boundaries and edge dislocations all act as both sources and sinks of vacancies. If an atom from a regular site join these defects they act as source of vacancy.The vacancy concentration increases. If an atom from these sites leave an fill a nearby vacancy they act as sinks of vacancy. Vacancy concentration decreases.
Nice