Approximately what is the vacancy concentration in a metal a

Approximately what is the vacancy concentration in a metal at a temperature just below its melting point? Approximately what is the dislocation density (in cm/cc) in a heavily deformed metal? When dislocations start to slip in a crystalline solid, what will happen to the solid?

Solution

a)At any given temperature, up to the melting point of the material, there is an equilibrium concentration

valency concentration of metasl :1:900

b) Dislocation density: total dislocation length per unit volume of material...,,

in heavily defored bodies it is approximately: 1091010 mm2

c) slip is nothing but when we apply some stress then body will deform parallely called as dislocations

it wlii change the properties of the materails