English
Русский 35-44 p.
The main goal of this article is to obtain welded permanent joints of modern thermally hardened aluminum and aluminum-lithium alloys made by laser welding, having mechanical characteristics (temporary tensile resistance, yield strength, elongation at break) and structural-phase composition close to or equal to the base alloy. It is shown for the first time that by controlling the parameters of heat treatment of samples with a welded joint of all studied aluminum-lithium alloys, it is possible to purposefully influence the formation of the specified mechanical properties of the weld by changing the structural and phase composition of the weld. The evolution of the structural and phase composition of welded joints of thermally hardened aluminum and aluminum-lithium alloys has been investigated using modern independent diagnostic methods: for the first time, the use of synchrotron radiation diffractometry in combination with high-resolution transmission, scanning electron and optical microscopy. The dependences of the increment of deformation under cyclic loading with amplitudes exceeding the elastic limit on temperature are established. For untreated welded joints, it was found that at +85 °C, the inhomogeneity of the deformation increment increases, and its speed increases by 8 times for alloy 1461, 5 times for alloy 1420 and 1.5 times for alloy 1441. At a temperature of -60 °C, alloys 1420 and 1461 have hardening stages, during which the value of deformation decreases at given boundary stress values. At +20 °C, there is a uniform increment of defor-mation and an increase in the amplitude of deformation with an increase in the amplitude of stress. At +85 °C, the strain amplitude does not change with increasing stress amplitude, its value is 0.55-0.5 of the strain amplitude at +20 °C. Based on the research results, technological techniques have been developed that allow obtaining mechanical characteristics and structural-phase compositions of welded joints close to the main alloy during laser welding of aviation thermally hardened aluminum and aluminum-lithium alloys of the Al-Mg-Cu. Al-Mg-Li, Al-Cu-Mg-Li, Al-Cu-Li systems.
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2. Karpov E.V., Malikov A.G., Orishich A.M. Influence of preliminary plastic deformation on the strength of a laser welded joint of aluminum-lithium alloy 1420. Deformation and destruction of materials. 2018. 5. P. 19 – 24. (rus.)
3. Karpov E.V., Orishich A.M., Malikov A.G. Influence of temperature on the destruction of laser welded joints of aluminum alloys for aviation purposes. Applied mechanics and technical physics. 2018. 5. P. 191 – 199. (rus.)
4. Kolobnev N.I. Khokhlatova L.B., Lukina E.A. Trends in the development of aluminum-lithium alloys and their processing technology. Moscow: All-Russian Research Institute of Aviation Materials. 2019. 367 p. (rus.)
5. Ahn J., He E., Chen L., Wimpory R.C. FEM prediction of welding residual stresses in fibre laser-welded AA 2024-T3 and comparison with experimental measurement. Int. J. Adv. Manuf. Technol. Springer London. 2018. 95 (9-12). P. 263.
6. Bailey N.S., Hong K.-M., Shin Y.C. Comparative assessment of dendrite growth and microstructure predictions during laser welding of Al 6061 via 2D and 3D phase field models Comput. Mater. Sci. Elsevier. 2020. 172. P. 291.
7. Dorin T., Vahid A., Lamb J. Aluminium Lithium Alloys. Fundamentals of Aluminium Metallurgy. Elsevier. 2018. P. 338.
8. Fotovvati B.A., Lewis G., Asadi E.Review on Melt-Pool Characteristics in Laser Welding of Metals. Adv. Mater. Sci. Eng. Hindawi Limited. 2018. 2018. P. 1 –18.
9. Hagenlocher C., Fetzer F., Weller D., Weber R. Explicit analytical expressions for the influence of welding parameters on the grain structure of laser beam welds in aluminium alloys. Mater. Des. Elsevier Ltd. 2019. 174. P. 91.
10. Kablov E.N., Antipov V.V., Oglodkova J.S., Oglodkov M.S. Development and Application Prospects of Aluminum-Lithium Alloys in Aircraft and Space Technology. Metallurgist. Springer Science and Business Media LLC. 2021. 65 (1-2). P. 81.
11. Malikov A., Orishich A., Bulina N., Karpov E. Effect of post heat treatment on the phase composition and strength of laser welded joints of an Al-Mg-Li alloy. Mater. Sci. Eng. A. Elsevier. 2019. 765. P. 138302.
12. Park J., Kim S.D., Kim S.H. First Evidence for Mechanism of Inverse Ripening from In-situ TEM and Phase-Field Study of 5' Precipitation in an Al-Li Alloy. Sci. Rep. Nature Publishing Group. 2019. 9 (1). P. 11.
13. Sidhar H., Martinez N.Y., Mishra R.S., Silvanus J. Friction stir welding of Al-Mg-Li 1424 alloy. Mater. Des. Elsevier B.V. 2016. 106. P. – 152.
14. Wang L., Wei Y., Zhao W., Zhan X. Effects of welding parameters on microstructures and me-chanical properties of disk laser beam welded 2A14-T6 aluminum alloy joint. J. Manuf. Process. Elsevier Ltd. 2018. 31. P. 246.
Eltsov R.I. Development of a technological process for manufacturing welded structures. Construction Materials and Products. 2021. 4 (5). P. 35 – 44. https://doi.org/10.34031/2618-7183-2021-4-5-35-44