The Russian 1370 Al-Mg-Si-Cu alloy (analogue of 6056) is an advanced material for the skin and stringers of fuselage. However, these alloys are susceptible to the intercrystalline corrosion depending on the heat treatment regimes. The investigations of the effect of heating temperature during the solid solution treatment (530-555)°C and quenching rate, ageing regimes and interval between the quenching and ageing on the structure and properties of 1370 alloy sheets were performed. The strengthening β (Mg2Si) -phase and Q (Al5Cu2Mg8Si6) -phase relationship dependence of the alloy properties is established. Using the dark field electron microscopy which permits to intensify separate diffraction reflexes of strengthening phases the structure of Q-phase precipitates has been studied. Optimization of heat treatment of 1370 alloy sheets provided the combination of fracture toughness characteristic (Kco= 100 MPa√m) high level, the ultimate strength of 400-420 MPa and intercrystalline corrosion no more 100 μm in depth.

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In the work, on the basis of the analysis of the phase transformations diagram for singlestage aging and temperature-time mechanical and corrosive properties for sheets of alloy 6013, it was established that the maximal values of the strength of the propertiescorrespond toa high tendency to intercrystalline corrosion. In order to improve the complex properties of sheets of alloy 6013 applied two-stage aging. Based on the analysis of the dependencies of the mechanical properties of sheets from alloy 6013 on temperature-time aging regimes, the regime of the first aging stage is selected-170 °С, 1,5 h. Keywords: hardening precipitates, phase transformations at aging, mechanical properties, corrosive properties, temperature-time maps of properties, regime of the first stage of aging. Введение. Сплавы системы Al-Mg-Si-Cu обладают хорошим сочетанием механических свойств, коррозионной стойкости, трещиностойкости, свариваемости и способности к формообразованию, что делает их весьма привлекательными для использования в Bulletin of Science and Technical Development www.vntr.ru № 5 (141), 2019

In this paper a task in developing of industrial production of cold-worked thin-walled tubes from high-tech aluminum alloy V-1341 of Al–Mg–Si system was accomplished. Tubes are purposed for application in hydraulic and air conditioning systems of aircraft products. Results of investigation of the structure and mechanical properties of tubes during their technological process and heat treatment are presented. Forming of tubes was performed and construction elements of pipelines were produced, which are identical to pipelines of commercial airplanes.