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Information × Registration Number 0213U003335, 0110U002350 , R & D reports Title Development of physical, chemical and technological principles of refractory coatings based on Ni-Al intermetallic compounds with the magnetic field. popup.stage_title Head Umanskiy Oleksandr Pavlovych, Registration Date 25-01-2013 Organization Frantzevich Insitute for Materials Science Problems of the Ukranian National Academy of Sciences popup.description2 It is shown the influence mechanism of the magnetic field on the structural transformation in intermetallic alloys based on NiAl. It is established that magnetic treatment differently affects on the mobility of nickel ions, which are in the condition of the local magnetic interactions, and non-magnetic aluminum ions. A significant effect of the magnetic field on the structure of NiAl is aligned with the local magnetic ordering in the alloy due to indirect exchange interaction between nickel atoms by collectivized conduction electrons. It is shown that magnetic treatment promotes separation of structure because the magnetically active Ni atoms under the influence of the magnetic field rapidly moove to the surface of the alloy. As a result, a new atomic configuration formed by a diffusion mechanism using Ni atoms jumping on the nearest neighboring vacancies of their own sublattice, as well as on aluminum sublattice in the NiAl intermetallic compound. Ia is proposed the scheme of possible atomic positions and movements in the surface layer of NiAl under the magnetic field activity. It is experimentally confirmed the influence effect of treatment on the dislocation structure of NiAl-Re in a magnetic field. Herewith, it is established the active movement of dislocations in this material, and the inclusion of rhenium acts as stoppers. It is shown that the samples processed in a magnetic field have the increased dislocation density in comparison with the original model, which is not the subjected to magnetic treatment. It is shown that the treatment in a magnetic field contributes to the inhomogeneity of the chemical composition of the intermetallic coating through its thickness with the formation of Ni-enriched surface layer. On surfaces which were the subject of the magnetic treatment, in the result of which their surface was enriched with nickel, the process of nickel oxide layers formation is stronger and greater depth as long as the scaling does not form a continuous layer of internal oxidation of aluminum oxide. Product Description popup.authors Бондаренко Олексій Аврамович Гальцов Константин Миколайович Карпенко Сергій Володимирович Коновал Володимир Павлович Леонтьєв Дмитрій Константинович Марценюк Ірина Семенівна Полярус Олена Миколаївна Сироватка Вячеслав Леонідович Терентьєв Олександр Евгенівич Чернацька Вікторія Юрьєвна Яковлева Маргарита Степанівна popup.nrat_date 2020-04-02 Close