Rybak N. Effect of the deformation type on the anisotropy of the physical and mechanical properties of polycrystalline metal with a hexagonal and cubic structure

The dissertation is devoted to the study of the effect on the texture and anisotropy of the physical and mechanical properties of deformation by rolling, alternating bending, and twist extrusion of some alloys with a hexagonal structure based on titanium (CT Grade 1 and VT1-0) and magnesium (Mg-10%), as well as the study of the influence direction of layer-by-layer 3D printing on the properties of metal powder-printed specimens of Inconel 718 (IN718), a heat-resistant superalloy with a face-centered structure, which is widely used in nuclear reactors, aircraft engines and other hightemperature devices, due to its high strength, creep resistance, and good corrosion resistance.The practical significance of the results of the study:The results of finding the characteristics of single crystals from the measurement data of the correspondingproperties in the Mg-5% Li polycrystalline samples can be applied to the finding of characteristics of single crystals of other hexagonal materials from the corresponding experimental data of polycrystalline samples, since obtaining single crystals sufficient to measure the corresponding properties is often a difficult problem.Thefound patterns of texture formation and changes in the damage parameters of titanium sheets after their straightening with the help of alternating bending canbeused to correct the technology for producing titanium sheet with optimal texture and structural characteristics.The results of studies of ZE10 magnesium alloy can be used to develop a technology for producing thin sheets of magnesium alloys with zinc, zirconium and rare earth metal additives with improved shape change characteristics andminimal anisotropy of mechanical characteristics.The above described methods for evaluating the physical and mechanical properties of polycrystalline materials with ahexagonal structure according to the Kearns texture parameters and the corresponding characteristics of single crystals can be used in then cases when the measuring of the property in a certain direction of a polycrystalline sample is difficult or impossible. For example, in the direction normal to the plane of thin sheets or along direction wire drawing, as well as perpendicular direction to the axis of extrusion.Patterns of texture formation and its inhomogeneity after twist extrusion can be used to develop new technologies that make it possible to create an optimal structure in metal samples that can improve material properties in many ways.Given that the VT1-0 alloy is rarely used as a structural material, a practical prospect for further research is to assess the texture formation and properties of titanium alloys for aerospace applications. Two-phase and pseudo-two-phase titanium alloys VT3-1, VT6, VT8, VT25 and others, widely used for the manufacture of compressor blades for gas turbine engines, can be distinguished among the mainones.Theresults of studying the texture and properties of the Inconel 718 alloy can be used to obtain parts by selective laser melting in the appropriate directions of 3D printing with an optimal set of propertiesThe rational use of crystallographic texture in the process of manufacturing parts by selective laser melting in the relevant directions of3D printing will allow obtaining parts with an optimal set of properties. The nearest prospect is to evaluate the effect of crystallographic texture on the mechanical properties ofsamples cut in the X, X+45° and Y directions from a plate produced by 3D printing in the XY plane, as well as samples cut in the corresponding directions from plates obtained using 3D - printing in the XZ and YZ planes.