CALCULATION OF ELECTRICAL-RESISTIVITY PRODUCED BY DISLOCATIONS AND GRAIN-BOUNDARIES IN METALS

The partial-wave method is used for the calculation of the residual el ectrical resistivity caused by dislocations and grain boundaries in va rious metals. The dislocation core is regarded as a resonance scatteri ng line defect containing surplus free volume. Scattering by elastic d istortions of the lattice is neglected. An estimation of the effective carrier concentration in transition metals is performed on the basis of Mob's theory. The proposed model for the evolution of the grain-bou ndary structure with misorientation angle regards the approach and con fluence of the line defects forming the boundary, and results in a dec rease of the resonance part of the total scattering cross section. The high-angle grain boundaries are assumed to consist of cylindrical voi ds. Taking into account the values of the steady Burgers' vectors, qui te satisfactory agreement with the available experimental data is obta ined.