№3-4, 2017
УДК 669.017.165
Influence of microadditives of transition metals and silver on properties sheets from Al–Cu–Mg system alloys
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.

№5, 2016
УДК 629.7.018.4
Nuzhnyy G.A.1, Gulina I.V.1
  • [1] Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation
  • Research of long-term action of permanent load and corrosion environment on fracture toughness constructional aluminum alloys
    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.
    Keywords: fracture toughness, corrosion environment, crack

    №4, 2016
    УДК 669.715
    Structure of aluminium powders for additive manufacturing, obtained by gas atomization
    Additive technologies allow receiving details from widely range of materials, including aluminum alloys. Thus high cooling rates during gas atomization of powders can lead to formation of nonequilibrium structures which can change during heat treatment. This paper deals with the results of investigation of microstructure of aluminium powder after different types of heat treatment. The work is carried out under the realization of integrated research area 10.3. «Technologies of atomization for producing high quality metallic powders for additive manufacturing and powder for brazing» («Strategic directions of development of materials and technologies for processing them for the period up to 2030»)
    Keywords: atomization, aluminium, powders, heat treatment

    №4, 2016
    УДК 669.715:669.884
    Structure aspects of 1441 Al–Cu–Mg–Li alloy ingots according to solution heat treatment methods
    The investigation of phase merging within 1441 Al–Cu–Mg–Li alloy ingots solution heat treatment was carried out. Raising temperature of solution heat treatment from 500 to 530°С causes almost complete nonequilibrium eutectic merge. 540°С, 24 h regime can cause partial melting of nonequilibrium eutectic on grain boundaries and ingot microporosity. Double-stage solution heat treatment of 1441 alloy with first stage at the 70–100°С lower point than the temperature of nonequilibrium solidus and high temperature second stage that is a little more than nonequilibrium solidus temperature allows reaching the most complete precipitation merge and raises material`s technical plasticity at the hot deformation temperature. The work within the framework of an integrated research area 8.1. «High-welded aluminum and aluminum-lithium alloys low density with high fracture toughness» («The strategic directions of development of materials and technologies of their processing them for the period till 203
    Keywords: Al–Cu–Mg–Li alloy, ingot, microstructure, solution heat treatment, differential thermal analisys

    №4, 2016
    УДК 669.715
    Features of forming of structure of round ingots from aluminum alloys on the basis of Al–Cu–Mg system
    Traditionally, in the open air of modern aviation technology products are used alloys based on the Al–Cu–Mg system. However, due to the ever increasing demand for the resource and reliability of the critical elements of the airframe requires improving service performance. One area of development to improve the lifetime characteristics of a multicomponent microalloying additives (Sc, Zr – up to 0,15%; Ag – 0,50%) to obtain a semifinished unrecrystallized structure. In this paper we present the main findings of phase dissolution features in the homogenization of ingots with a diameter of 100 mm from alloy series 1163 and future vysokoresursnyh alloy B-1167. Abstract macro and microstructure, phase composition of the ingots as cast and homogenised state. An assessment of their technological properties. The studies show a positive effect of an integrated micro-alloying with transition metals (Sc, Zr) and Ag. The work within the framework of an integrated research area 8.1. «High-welded al
    Keywords: structure, phase composition, properties, MRSA analysis

    №3, 2016
    УДК 669.715:621.785
    Ber L.B.1
    TTT (temperature–time–transformation) and TTP (temperature–time–property) diagrams for aging of heat treatment strengthenable aluminum alloys. Their use for the development of step aging regimes
    There were considered the isothermal TTT (temperature–time–transformation) and TTP (temperature–time–property) aging diagrams for Al–Cu, Al–Cu–Mg, Al–Zn–Mg–(Cu), Al–Mg–Si–(Cu) system heat treatment strengthenable aluminum alloys. The use of optimal step aging regime instead of single-step regime is effective for improving the complex of properties or to accelerate the aging. The optimum phase composition of hardening precipitates was determined with using the TTT and TTP aging diagrams. The regimes for first low temperature aging step (LA), at which for second high temperature aging step (HA) the disperse hardening precipitates that have arisen in the volume of grain at the first aging step will inherit the disperse hardening precipitates, forming at the second aging step. The recovery at the HA step is not necessary, which facilitates the commercial application of these aging regimes. Examples of the effective step aging regimes for the aluminum alloys of different alloying systems we
    Keywords: heat treatment strengthenable aluminum alloys, TTT (temperature–time–transformation) aging diagrams, TTP (temperature–time–property) aging diagrams, step aging regimes.

    №3, 2016
    УДК 669.715
    Naumova E.A.1, Nikitin B.K.1, Gromov A.V.1
  • [1] Bauman Moscow State Technical University
  • 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.

    №1, 2016
    УДК 621.762.4.04
    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.

    №1, 2016
    УДК 669.715
    Naumova E.A.1
  • [1] Bauman Moscow State Technical University
  • Effect of heat treatment on the structure and hardening of the eutectic alloy based system Al–Ca with the addition of scandium
    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.

    №6, 2015
    УДК 669.2:669.131
    Development of manufacturing techniques of semi-finished products of alloys of the titanium, excluding defect formation and raising material inspectability
    This article generalizes existing experience in production of critical parts of titanium alloys. It gives main approaches to maximum reduction of defectiveness level and increase in homoge-neity of final products. It is shown that quality of charge materials and subsequent remelting are of great importance. A rational approach to material conversion process allows increasing controllability. In this regard process parameters are of paramount importance as well as a correct selection of part geometry by a designer for nondestructive testing. It is also pointed out that a correct selection of a material grade influences structural homogeneity and a result-ing complex of mechanical and service properties.
    Keywords: titanium alloys, charge materials, ultrasonic inspection, remelting, deformation.

    №6, 2015
    УДК 669.295
    Influence of the corrosion and active environment on fracture toughness of titanium al-loys pseudo-β-class
    Results of researches of phase composition, structure, corrosion and mechanical properties of the titanium pseudo-β-alloy ВТ22 forgings are presented. Influence of a microalloying by ruthenium on above-mentioned characteristics of the alloy, including fracture toughness in the corrosive environment is considered.
    Keywords: titanium alloys, mechanical properties, corrosion resistance and mechanical strength, microalloying, microstructure.

    №6, 2015
    УДК 669.295
    Designing of power equipment supposes, as a rule, its behavior under over calculated loaded conditions at a short time. For details and assemblies of steam turbine units, made by high strength weldable pseudo-alpha-titanium alloys, it is necessary to calculate their specific properties for saving serviceability.
    Keywords: pseudo-alpha-titanium alloys, power-machine equipment, overloaded conditions.

    №4, 2015
    УДК 621.74:669.295
    L.I. Rassohina1, Bityutskaya O.N.1, P.I. Parfenovich1
  • [1] Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation
    The study involved issues of development of structures of molds for the production of castings of γ-TiAl alloys on the basis of water dispersion of aluminum oxide, suspension, mechanical properties of ceramic samples. The conclusions about the need to continue exploration in this sphere
    Keywords: casting alloys based on titanium, ceramic slurry, a binder, shell shape, fused.