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Information × Registration Number 0224U033567, (0123U102996) , R & D reports Title Investigation of changes in the performance characteristics of functional materials during thermomechanical treatment popup.stage_title Дослідження впливу високих температур на функціональні властивості мартенситних сплавів. Визначення механізмів впливу обробки на властивості мартенситних сплавів з використанням теоретичних методів. Head Kosohor Anna О., Доктор фізико-математичних наук Registration Date 30-12-2024 Organization Institute of Magnetism NAS of Ukraine and MES of Ukraine popup.description1 The goal of this project is to experimentally and theoretically study the effect of thermomechanical treatment on the mechanical, transformational, and thermodynamic properties of various alloys, describe the mechanisms of thermomechanical treatment on the properties of alloys, and develop methods for optimizing their functional properties. popup.description2  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: Phase transition theory, magnetic and deformation measurements, measurements of magnetoresistance and specific heat capacity. Key Results: - It was found that the addition of Sb to the antiferromagnetic alloy Ni50Mn50 induces ferromagnetic interactions, leading to a sharp decrease in the Néel temperature. An increase in Sb content further promotes interactions between antiferromagnetic and ferromagnetic states, resulting in the emergence of a spin-glass state. - On the phase diagram of temperature versus Sb concentration, six magnetic phases of the Ni50Mn50-xSbx system were identified, including antiferromagnetic, paramagnetic, and ferromagnetic martensite, spin glass, and paramagnetic and ferromagnetic austenite. - For Ni50Mn50-xSbx (0 ≤ x ≤ 25), a significant impact of magnetic ordering on low-temperature heat capacity was revealed. It was demonstrated that neglecting the magnetic contribution in the ferromagnetic phase leads to a twofold overestimation of the electronic heat capacity, which is empirically derived from experiments. Product Description popup.authors Velyhotskyi Dmytro V. Zamorskyi Vladislav O. popup.nrat_date 2024-12-30 Close