Scaling of the spacing of deformation induced dislocation boundaries

Methods for determining the distribution of spacings between near-planar dislocation boundaries are discussed. Subsequently, distributions of spacings for these boundaries have been determined for both single crystal and polycrystal samples. Misorientations across the extended planar dislocation boundaries were also measured for the single crystal samples. The probability density distribution for spacings exhibits a scaling behavior of nearly identical form to that seen for the probability density distribution of misorientation angles across these boundaries. The scaling behavior of the spacing distributions persists over a very wide strain range (epsilon(nu M) = 0.2-epsilon(nu M) =4.5) for different materials and deformation conditions. The scaling behavior of the boundary spacings can be accounted for by simple geometric models allowing for either formation or coalescence of these walls. Published bq Elsevier Science Ltd oil behalf of Acta Metallurgica Inc.