Goncharova I. Determination of physical and mechanical properties of materials with different crystal structures by indentation method.

The method for determination of plasticity characteristic (as a part of plastic deformation in the total deformation during indentation) for high strength materials was developed, wherein the incompressibility of material under indenter is considered for determination of the plastic deformation only. This method allowed to calculate the plasticity of new high strength materials. The fundamental plasticity characteristic at 0 K (at the dislocation mechanism of deformation without the help of thermal atomic oscillation), i.e. in conditions when Peierls-Nabarro stress are defined, is introduced and calculated. The new concept of plasticity for the first time allowed to determine and compare the plasticity of high strength materials, which are brittle under tensile tests. Developed conception and methods have shown the appropriateness of definition and analysis the plasticity characteristic at the study of microhardness. Developed new methods of study of mechanical properties at the local loading by pyramidal indenter allowed to obtain the deformation curves for brittle at standard mechanical tests alloys, including alloys with intensively twinning during deformation. The physical conception about the temperature dependence of ceramic hardness on the porosity was developed. For the first time the mechanical properties of targets after a impact loading by kinetic energy projectile were investigated by indentation method. Grain structure and dislocation substructure near the penetration channel were studied. That is necessary for the development of physical concepts of physics penetration of target by kinetic impact.