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An Electrical Resistivity Study of Lattice Defects in Deformed Iron

To elucidate the effects of purify and deformation temperature on the production of lattice defects, strain-induced electrical resistivity Δρ has been measured at -196°C as a function of true strain εT. In deformation at -196°C, Δρ varying according to εT3/4 has been divided into a part Δρa which anneals out at room temperature and its residual part Δρr. The latter changes linearly with εT. The rate of increase of Δρ becomes larger as the purity is reduced, but does not depend on method of straining, i.e., interrupted deformation or continuous one. In deformation at room temperature, the rate is much lower than that at -196°C, and is less dependent on purity. An analysis of Δρr, and Δρ under room temperature deformation indicates that dislocations are the major contributions to Δρr and Δρ, and the specific resistivity of dislocations in iron is evaluated as (1.0±0.4)×10-18 Ω cm3.