Relation between the strength characteristics of iron and nickel and the electronic structure of defects by positron annihilation spectroscopy

A relation between the parameters characterizing the fracture due to cyclic deformation and the electronic structure (ES) of defects in iron and nickel is discussed. The change of ES of defects in nickel is characterized both, by the change of the electron density and its redistribution between the conduction and ionic core states. In technical iron, the change of ES in defects is probably connected also with the decoration of the surface of defects by carbon atoms and/or with the possible micro-nuclei of a new phase initiated by the deformation process. [Russian Text Ignored].