Sokolenko V. The influence of structural defects and stresses on the physical-mechanical properties of transition metals, as well as alloys and compounds

Object: Phenomena and mechanisms, determining plastic flow, fracture, phase transitions and electrical transport in transition metals, as well alloys and compounds. Purpose: to establish the basic regularities and physical mechanisms of influence of deformation defects and mechanical stresses, and also quenching vacancies and impurities on the electro-physical characteristics, effective microscopic parameters and mechanical properties of nonsuperconducting, superconducting and magnetic-ordered transition metals, alloys and compounds. Methods: deformation; measurements of electrical resistivity, superconducting transition and strain; analytical calculations and microscopy. Results: it is established the opposite character of change of intensities of interband and intraband electron-phonon scattering and effective microscopic parameters in bcc and fcc transition metals as a result of introduction the own defects as compared to easy impurities. The influence of strains and different types of defect structures on superconducting parameters of Nb, V, Zr and composites based on Nb3Sn is studied. It is shown the increasing of mechanical stability of HTSC YBa2Cu3O7-х and hard-magnetic Nd2Fe14B ceramics as a result of low-intensity ultrasonic action. It is established that magnetostriction deformations and low temperature phase magnetic transformations are caused by the structural relaxations in chromium and its alloys. The field of application: physics of a solid body, the electrophysics, the physics of metals