VARIATION OF DISLOCATION DENSITY AND STORED ENERGY WITH GRAIN SIZE

The stored energy of metals due to the dislocation density resulting from deformation in creases for a given strain as grain size de creases. This variation with grain size be comes less as the strain increases. This variation of dislocation density with grain size is explained in terms of the average distance the dislocations move during deformation. Dislocation densities, which are in good agreement with densities counted from electron transmission micrographs, are calculated on the basis of this interpretation. It is also found that the variation with strain of the average distance of dislocation motion is in agreement with the observed change in deformation cell size and strain.