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Information × Registration Number 0211U000853, 0109U006147 , R & D reports Title Line shift at the phase diagrams of nanocrystalline materials and structure evolution beyond shidted equilibria popup.stage_title Head Gusak Andriy Mykhailovych, Доктор фізико-математичних наук Registration Date 25-02-2011 Organization Cherkasy National University popup.description2 Methods of phase diagrams construction for disperse materials and nanograined alloys are analyzed. Phase shifts at the Cu-Ni phase diagrams are analyzed. Segregation of copper atoms at the grain boundaries of copper-nickel alloy is modeled. At that, Srolovits model is used, enabling substitution of atomі in the sites as well as the shifts of sites themselves. Modeling gave dependences of segregation enthalpy and copper concentration on the number of atomic plane (on the distance from GB). Possibility of redistribution of components with different atomic sizes between grains of different sizes is analyzed. Effect, which is due to product of difference of Laplace tensions and difference of atomic volumes, can well be larger than fluctuation concentration background and can lead to substantial spread of spinodal curve. Decomposition kinetics for supersaturated solution of tin in lead at room temperature and at -15C is studied. Influence of plastic deformation on the decomposition rate and decomposition extent is found. Theoretic analysis of point contact reactions in nanowires is made. Process is shown to be controlled by diffusion of metal atoms along the silicon dioxide surface with simultaneous penetration through this nanometric film of native amorphous oxide into the silicon wire. This leads to nucleation and step-by-step epitaxial growth of silicide along the wire. Respectively, we presented a first version of Flux-driven Nucleation in open systems controlled by the divergence of external fluxes in the nucleation place. New idea of two factors competition in decomposition of binary nanograin is suggested. Namely, nonlocal segregation at the surface (due to surface tension dependence ofn composition) assists decomposition, contrary to depletion effect. Product Description popup.authors Гусак А.М. Запорожець Т.В. Ковальчук А.О. Король Я.Д. Ляшенко Ю.О. Сльозов В.В. Шірінян А.С. popup.nrat_date 2020-04-02 Close