Source: http://materialsnews.ru/en/articles?rub_id=13
Timestamp: 2019-04-22 16:19:10+00:00

Document:
The state-of-the-art review of deformable aluminum alloys of Al–Cu–Mg system is carried out. Microalloying influence by additives of transition metals (Sc, Zr) and silver of sheet semi-finished products from sredneprochny alloys on the basis of Al–Cu–Mg system is investigated. Alloys with different ratio of Cu/Mg are considered. Mechanical properties, fatigue and fracture toughness characteristics are defined at the room temperature. The positive effect of use of complex microalloying by transition metals (Sc, Zr) and Ag is shown.
Keywords: structure, properties, sheets, Al–Cu–Mg, silver, transitional elements.
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Method of research of kinetics of destruction metallic material by long-term action of permanent load and corrosion environment based on specimen of new type was worked out. This specimen excel specimen of standard ASTM Е1681 in functional capabilities that intended for threshold valuation of stress intensity factor at fixed crack opening by bolt and may was exhibited on exposition in any corrosion or aggressive environment and also have the opportunity to definition of applied tensile load to specimen in testing. Testing of specimens of slab constructional aluminum alloys 1163-Т и V95p.c.-Т2 was carried out. Paradoxical fact of growth of conventional stress intensity factor by propagation of corrosion crack was determined that was conditioned by change of topography of ruptured zone.
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Keywords: heat treatment strengthenable aluminum alloys, TTT (temperature–time–transformation) aging diagrams, TTP (temperature–time–property) aging diagrams, step aging regimes.
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Investigation of technological and mechanical properties of new casting eutectic aluminum alloys of type "Natural Composites"
The structure, castability and deformability of some ternary eutectic alloys (Al–Ca–Ni, Al–Ca–Cu, Al–Ca–Fe and Al–Ca–Si) in the as-cast and heat treated states were studied. The ternary eutectics (Al)+Al4Ca+Х (where X – ternary compound) had a much finer structure as compared to the Al–Si eutectic, which suggests a possibility for the creation of the so-called natural composites produced by conventional casting.
Keywords: Al–Ca–Ni, Al–Ca–Cu, Al–Ca–Fe and Al–Ca–Si phase diagrams, heat treatment, microstructure, castability, hot tearing, deformability.
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The paper is devoted to research the structure of interphase boundaries in solid alloys received by explosive pressing the powder mixtures of chromium carbide Cr3C2 and titanium. Using the electron microscopy established that similar boundaries have a final thickness over which there is a smooth change in the chemical composition of the material with complicated crystalline structure.
Keywords: chromium carbide, titanium, explosive compacting of powders.
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It was investigated the changes in the structure and properties of the alloys Al–7,6Cа and Al–7,6Ca–0,3Sc during annealing. Separately considered the influence of changes in eutectic intermetallic compounds to changes in hardness and the impact of nanoparticles Al3Sc in the process of disintegration of the solid solution of aluminum. The disintegration of the aluminum solid solution studied directly in the heating process in the column of an electron microscope.
Keywords: Al–Ca–Sc, nanoparticles Al3Sc, heat treatment, fragmentation, spheroidization, eutectic, hardening.
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Keywords: casting alloys based on titanium, ceramic slurry, a binder, shell shape, fused.
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