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Registration Number

0209U006078, 0106U005492 , R & D reports

Title

Microplastic, macroplastic and superplastic deformation interconnection in the context of structural state of materials

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Head

Andronov Volodimir Mihailovich,

Registration Date

21-01-2009

Organization

Kharkov national university named after V.N. Karazin

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Objects of experimental researches - deformable industrial aluminum alloys: 1420, 1421, 1423, 1450, 1460, AMg6, AK 4-1ч, 6111, amorphous metallic alloys Ni78Si8B14 and Fe40Ni40B20. The purpose of the third stage of this work is the determination of conditions of superplasticity effect occurrence and the investigation of features of structural changes during the superplastic deformation of deformable aluminum alloys 6111 and AK4-1ч specimens. The aim is also the generalization of data about the mechanism of development of cavity structure, the mechanism of development of fibrous formations and the mechanism of superplastic deformation of specimens of aluminum alloys. The purpose also concludes in the investigation of microplasticity of growing old alloys on the base of aluminum and iron, and also highamplitude internal friction near to Kuri point of disperse phases in highcarbon heterophase alloys on an iron base. Establishment of influence of temperature and previous straining on time dependences of pressure in amorphous metallic alloy Ni78Si8B14, studying of processes which are carried out at uniaxial plastic deformation by a deformation with constant strain rate and at fracture of specimens of amorphous metal alloys Ni78Si8B14 and Fe40Ni40B20 in the range of temperatures 300 K - 4,2 K. Research methods are the mechanical tests, mechanical spectroscopy, a string technique, metallography, X-ray structural analysis, X-ray spectral and energy-dispersion microanalysis, fractography, appearing through and raster electronic microscopy, the thermal analysis. Conditions of occurrence of superplasticity by alloys 6111 and AK4-1ч, and also features of kinetics of phase transformations and structural changes which are carried out in them during superplastic deformation are established. Data about the mechanism of cavity structure development, the mechanism of development of fibrous formations and the mechanism of superplastic flow of specimens of some aluminum alloys are generalized. Microplasticity of specimens ofgrowing old alloys on the base of aluminum and iron is studied, the kinetics of a mechanical relaxation of specimens of alloys Ni75Si8B17 and Fe45CO45Zr10 at a room temperature and mechanisms of destruction of specimens of alloys Ni78Si8B14 and Fe40Ni40B20, deformed in the range of temperatures 300 K - 4,2 K are established. The kinetics of a mechanical relaxation of specimens of alloys Ni75Si8B17 and Fe45CO45Zr10 at a room temperature and mechanisms of destruction of specimens of alloys Ni78Si8B14 and Fe40Ni40B20, deformed in the range of temperatures 300 K - 4,2 K is established too. Results of SRW can be used for improvement of physical theories and specification of representations about microplasticity, plasticity, superplasticity and an internal friction of crystal and amorphous materials, and also for working out new constructional and, in particular, composite materials.

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2020-04-02