Relaxation Structure Formation in Deformation of Nickel

摘要

The purpose of this study was to quantitatively investigate the relaxation structure formation in polycrystalline nickel deformed by rolling at room temperature. The relaxation structures were examined on polycrystalline nickel with a purity of 99.99% Ni, deformed by rolling. The sub-structure of nickel after rolling to 50-80% was examined by the TEM and X-ray analysis methods by line profile analysis. It was revealed the presence of three qualitatively different types of structural elements: microbands of a macroscopic length; cells of different shapes and dimensions; micrograins less than 80 nm in size. The normalized curves of distribution of cells dimensions coincide, which suggests a scale invariance of these parameters. On the other hand, addition of normalized dimensions of micrograins to statistical dependence of dimensions of the cells leads to distortion of the dependence. The mechanisms of formation of the cells and micrograins to be different: micrograins were shown are nuclei of primary recrystallization.