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Information × Registration Number 0302U005146, 0100U003282 , R & D reports Title Relaxation-accomodation processes in polycrystals and its influence to the mechanical properties of metalls and alloys in the difference strain conditions popup.stage_title Встановлення особливостей змін мікроструктури, фазового складу та надпластичності сплавів Pb-Sn у залежності від режиму старіння Head Sirenko A.F., Registration Date 25-03-2002 Organization Kharkov National University named after V.N.Karazin popup.description2 Experimental investigations aimed to finding out the connection between deformation processes and structural changes which occur under the superplastic conditions in eutectic Pb-62% Sn alloy have been done. The experiments have been done with cast alloy which was reduced then for 70% under the room temperature. Mechanical tests under the creeping conditions and constant applied stress, microstructure and X-ray investigations have been carried out. Experimental data concerning crystal lattices parameters changes, diffractional intensities of X-rays maximums and volume ratio of phases in the alloy under different conditions of aging and deforming have been obtained. An explanation of reasons for phase-structural changes occurring in Pb-62% Sn alloy under superplastic deforming conditions has been proposed. The character of origin and development of two-dimensional aluminum polycrystals plastic deformation rotational mode has been investigated experimentally from room temperature to 300 oC. It is shown that the reorientation bands of a different type and different amount are oriented uniformly in limits of one grain. It tesify that the reorientation bands formation mechanism is determined by crystalllographic orientation of a grain. For certification of the separation boundaries of "grain bodies — reorientation band" the reorientation matrixes were used, the computer program is developed which allows to discover all equivalent expositions of the same orientation and to choose basic. It is shown that irrespective of a reorientation bands type, all investigated bands are (in view of a Brendon criterion) close to special. Product Description popup.authors popup.nrat_date 2020-04-02 Close