The plastic deformation in the cold state generates an increase of the density, of the dislocation and this intensifies the diffusion process in the powder volume and substantially modifies the interfacial characteristics of these by creating some big concentrations of crystalline flows of the type of interstitial allows and vacancies. Knowing the fact that the mobility of the interstitial atoms is bigger than that of the vacancies, these areas can be at a certain moment suprasaturated in vacancies, which could strongly affect the diffusion process.
