Magnetic studies of the dislocation structure of iron single crystals deformed at 295 K

The dislocation density in iron single crystals deformed at 295 K has been studied by measuring the coercive field, the initial susceptibility, the Rayleigh constant, and the reversible susceptibility in the approach to ferromagnetic saturation as functions of the resolved shear stress. The influence of different dislocation types on the saturation susceptibility has been calculated. In this way it is possible to distinguish dislocation structures composed of screw or edge dislocations and to reveal long-range internal stresses, which govern the work-hardening in the deformation stage II/III. The dislocation density increases in stage I linearly and in stage II/III quadraticaly with the resolved shear stress. In stage O mainly isolated screw dislocations are created.