Perm National Research Polytechnic University, Perm, Russia

R. О. Lyskov, Postgraduate Student of the Department of Mechanics of Composite Materials and Structures of the Aerospace Faculty, dialogg12@mail.ru
S. А. Oglezneva, Professor of the Department of Mechanics of Composite Materials and Structures of the Aerospace Faculty, Doctor of Technical Sciences, ogleznevasa@pstu.ru
А. А. Smetkin, Associate Professor of the Department of Mechanics of Composite Materials and Structures of the Aerospace Faculty, Candidate of Technical Sciences
V. G. Gilev, Educational Master of the Department of Mechanics of Composite Materials and Structures of the Aerospace Faculty, Candidate of Technical Sciences
М. P. Тretyakov, Deputy Director of the Center for Experimental Mechanics of the Aerospace Faculty, Candidate of Physical and Mathematical Sciences
А. V. Lykova, Associate Professor of the Department of Experimental Mechanics and Structural Materials Science of the Aerospace Faculty, Candidate of Technical Sciences

Reducing the surface roughness of aluminum alloys makes it possible to increase reliability, durability, wear resistance, heat transfer efficiency and other functional properties of products. Electrolytic plasma polishing (EPP) is an effective method that can be especially useful for the surfaces of alloys with submicro- and nanocrystalline structures, which have recently been obtained by deformation in the superplasticity mode. It makes it possible to manufacture products of complex shapes. The purpose of the work is to study the effect of the electrolyte composition and the parameters of electrolytic plasma polishing on the structure, properties and surface roughness of a relatively new aluminum alloy 1565ch. EPP has been performed on samples of alloy 1565ch M (TU 1-3-194–2011) in a 25 kW unit with a voltage of 300–330 V, a current density of 0.43–0.93 A/cm², an electrolyte temperature of 55–75 ^оC and a processing time of no more than 5 minutes. The studies have included the determination of surface roughness, microstructure and elemental composition, grain size and shape, X-ray phase analysis, and quasi-static tensile testing of flat samples. As a result of experimental studies, a suitable electrolyte for EPP and process parameters have been selected. It has been found that the EPP of the surface of the 1565ch aluminum alloy is an effective substitute for traditional surface polishing methods: within 30 seconds, the value of the surface roughness index Ra has decreased from 0.56 to 0.33 microns. At the same time, EPP does not significantly affect the micro- and substructure of the surface, as well as the strength properties. Studies of the surface of the 1565ch alloy polished by EPP have made it possible to trace the structural features in the fracture zone of the samples tested for tensile strength at 300 ^оC.

The research was carried out at the expense of a grant from the Russian Science Foundation (project No. 25-19-00747).

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