Pravednaya N. Transformation of the Texture and Anisotropy of Physical and Mechanacal Properties of Aging Polycrystals

The thesis was first carried out a comprehensive study of the effect of alternating bending (AB) on the crystallographic texture, microstructure and mechanical properties of aluminum strips. It is shown that the greatest change of the anisotropy properties of sheets of aluminum, occurring during the first three - five cycles of miners, due to crystallographic texture, which is expressed in the presence of the identified significant linear correlation between the characteristic of texture, on the one hand, and of the yield strength and tensile strength on the other hand, with the reliability correlation coefficients 0.77 and 0.85 accordingly.On the diagrams stress - strain curve is observed the ground of yield, in contrast to tensile tests - compression. We found the elastic modulus and yield strength for different directions of the alloy sheets by means diagrams curve of stress - bend strain. Were determined the anisotropy of the elastic modulus and yield stress in the plane of rolling of the alloy. We found the anisotropy of the endurance limit of the alloy in the rolling plane. We established experimentally the anisotropy of electrical conductivity in the sheet aluminum alloy D16 with a cubic lattice after quenching and cold rolling. On the basis of the fractal model of the structure of the deformed metal identified the main components of the dislocation contributions to the overall texture of the anisotropy of electrical conductivity and thermal conductivity of the alloy D16. It is established that the natural aging of polycrystalline aluminum alloy D16 does not change the type of texture formed after quenching and deformation by rolling. In the early stages of natural aging of polycrystalline alloy (up to 2 days), the anisotropic change in electrical resistance, which is expressed in the growth direction in the TD and 450 for RD and fall along the rolling direction, due to the anisotropic formation of Guinier-Preston zones.