Zietova T. Substructural and orientation changes coming true during a flowage two-dimensional polycrystalline aluminium and copper at a room temperature.

Thesis for a Doctor of philosophy degree (Ph.D.) in physics and mathematics on speciality 01.04.07 - Solid State Physics. V.N. Karazin Kharkiv National University, Kharkiv, 2017. The thesis presents the results of experimental studies of substructural and orientational changes that accompany plastic deformation dimensional polycrystalline aluminum and copper with different grain size in terms of active load at a constant speed at room temperature. It is shown by experiments that the substructure of aluminum polycrystalline samples befor their deformation varies by distribution of subgrain in size and crystallographic orientation, their shape and size. Experimentally was detected an abnormally high strain of areas of coarse aluminum sample containing grain boundary general type that leads to its emergence in "loosening" and near-boundary area boundary cracks, which is further spread in the body of the grain. Experimentally found that some local relative deformation coarse grain polycrystalline samples of aluminum, deformed in terms of active load at a constant speed of deformation at room temperature until their destruction can exceed the strain of the whole sample. It is shown that the variety of original two-dimensional microstructure of polycrystalline copper leads to different ways of relaxing the stress state in the process of plastic deformation and changes to the mechanical properties of the samples. Keywords: two-dimensional polycrystals, a quasiperiodic relief, plastic deformation, color orientation maps, visualization, substructural and orientational changes, dispersal grain boundary.