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Information × Registration Number 0203U008024, 0100U003282 , R & D reports Title Relaxation-accomodation processes in polycrystals and its influence to mechanical properties of metals and alloys in the difference strain conditions popup.stage_title Head Sirenko A., Registration Date 10-04-2003 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 that was reduced then for 70% under the room temperature. Mechanical tests under the creeping conditions and constant applied stress * = 7,8-10,1 МPа, 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 plastic deformation rotational mode arising and development in two-dimensional aluminum polycrystals has been studied experimentally in temperature interval from room temperature to 300оС. It is shown that running temperature result in realization of different type reorientation bands. In spite of reorientation band types and its amount the latter are oriented uniformly in limits of one grain. It is testified that the reorientation bands formation mechanism is determined at first by crystallographic orientation of the 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