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Information × Registration Number 0224U000581, 0123U102996 , R & D reports Title Investigation of changes in the performance characteristics of functional materials during thermomechanical treatment popup.stage_title Head Kosohor Anna О., Доктор фізико-математичних наук Registration Date 09-01-2024 Organization Institute of Magnetism NAS of Ukraine and MES of Ukraine popup.description2  Research Object – Shape memory alloys. Objective – Comprehensive experimental and theoretical investigation of composite nanostructured magnetic materials, as well as the influence of magnetic field, mechanical loading, and changes in chemical composition on the functional characteristics of such materials. Research Methods: Theory of phase transitions, magnetic and deformation measurements, magnetoresistance measurements. Key Results: - Magnetization measurements and temperature dependence of the elastic modulus of the Ni-Fe(Co)-Ga shape memory alloy were conducted. The transformational properties and thermal hysteresis of the alloy were characterized. It was demonstrated that the thermal hysteresis in a magnetic field of 1.5 kOe increases by 11 degrees. - Theoretical analysis indicates that the increase in thermal hysteresis in a magnetic field is associated with a single-variant martensitic state. The temperature dependence of the Young's modulus was calculated for a twin crystal with different volume fractions of twin variants. - Theoretical calculations suggest that the single-variant martensitic state has a lower temperature of direct martensitic transformation and a smaller Young's modulus compared to the two-variant state. Product Description popup.authors Velyhotskyi Dmytro Volodymyrovych Samorskiy Vladislav O. popup.nrat_date 2024-01-09 Close