Résultats de la recherche - nanostructures

The crystallization of silumins has been shown to be a nanostructured process. Liquid silumin consists of elementary nanocrystals of aluminum and silicon, free atoms of aluminum and silicon, aluminum-silicon complexes. Primary microcrystals are formed from them. Eutectic microcrystals are formed fro...

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Steel crystallization has been shown to be a nanostructured process. Austenite microcrystals in liquid steel with a carbon concentration of 2.5 to 9 atomic percent, δ‑ferrite microcrystals in melt with a carbon concentration of up to 2.5 atomic percent, austenite microcrystals in peritectic reaction...

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Based on thermodynamic calculations, it is shown that metal crystallization is an equilibrium nanostructural process. At the beginning, trigonal or tetragonal structure-forming nanocrystals are formed from elementary nanocrystals. Then crystallization centers are formed from them. Further, tetragona...

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It is shown that at crystallization of alloys the sophisticated nanostructural processes have place. The nanocrystals of phases, their atoms, the centers of crystallization of dendrites, surface-active elements, gases, modifying elements, poorly soluble impurity elements generally participate in the...

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Crystallization of cast iron has been shown to be a nanostructured process. Austenitic-graphite eutectic is formed from iron and graphite nanocrystals, free iron and graphite atoms. Austenitic-cementite eutectic is formed from iron and graphite nanocrystals, free graphite atoms and iron-carbon compl...

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On the basis of thermodynamic analysis it is shown that metal melts are the nanostructured systems which consist of phases and atoms nanocrystals. Nanocrystalsmake 97% ofthemeltvolume.

Theoretical and experimental prerequisites of development of nanostructural topokompozit (NSTK) - the materials capable to keep the increased operational properties at high temperatures of a tribonagruzheniye are considered. The cathodic system of vacuum installation is developed for receiving nanos...

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Crystallization of casting alloys has been shown to be a nanostructured process. Microcrystals of phases in the temperature range of liquidus and solidus, during eutectic and peritectic reactions, are formed from nanocrystals of components A and B of alloys, their free atoms and atomic complexes. Mi...

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It is generally accepted that physicochemical reactions are mainly molecular atomic. It was shown that liquid water consists of 12 % molecules and 88 % of ice nanocrystals. When melting, microcrystals of substances break down into nanocrystals and molecules or into nanocrystals and atoms. During the...

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We have theoretical investigated the magnetorefractive effect (MRE) in nanostructures. We discuss possibility of magnifications for this effect. MRE can be considered as variations of the coefficients of reflection, transmission and absorption of electromagnetic waves of samples with magnetoresistan...

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The aim of this study was to develop a technique to analyze the crystalline and particulate morphology of highly disperse complex metal and metalloid oxides, which include both crystalline and amorphous phases, using X-ray diffraction (XRD) data to compute crystallite size distributions (CSD) compa...

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