Siberian State Industrial University, Novokuznetsk, Russia

S. V. Кonovalov, Vice-Rector for Research and Innovation, Doctor of Technical Sciences, Professor, konovalov@sibsiu.ru

Е. V. Aryshensky, Head of the Department of Pressure Metal Treatment and Materials Science of EVRAZ West Siberian Metallurgical Plant, Doctor of Technical Sciences, Associate Professor, ar-evgenii@yandex.ru

Samara National Research University named after Academician S. P. Korolev, Samara, Russia.

А. А. Ragazin, Engineer of the Industry Research Laboratory No. 4, sanekragazin63@mail.ru
V. Yu. Aryshensky, Chief Researcher of the Industry Research Laboratory No. 4, Doctor of Technical Sciences, Professor, Arysh54@mail.ru

M. N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia
D. Yu. Rasposienko, Chief Researcher, Candidate of Technical Sciences, rasposienko@imp.uran.ru

The influence of two- and three-stage homogenization, chemical composition, and rolling modes (hot and cold) on the formation of mechanical properties of aluminum alloys of the Al – Mg system has been studied. The studied alloys have been smelted in an induction furnace and cast into a steel mold. Then, the ingots have been homogenized according to two- and three-stage modes with subsequent measurement of microhardness. After homogenization, samples with maxi mum microhardness have been subjected to hot and cold rolling on a reversing mill. Mechanical properties have been tested on the sheets obtained after cold rolling and annealing. The microstructure of 1590-4 alloy sheets has been studied by transmission electron microscopy after annealing at a temperature of 440°C for 30 minutes. It has been established that additional alloying of alloys of the Al – Mg – Sc – Zr system with hafnium and erbium increases the mechanical properties in the cast state compared with alloy 1580, regardless of the homogenization mode. The effect of the homogenization mode on the mechanical properties after hot rolling at a temperature of 450°C with subsequent cold rolling is investigated. It is noted that two-stage homogenization provides higher mechanical properties after rolling for alloys of the Al – Mg – Sc – Zr system alloyed with hafnium and erbium, compared with three-stage heat treatment. It has been revealed that hightemperature three-stage homogenization leads to a slight decrease in the mechanical properties of alloys of the Al – Mg – Sc – Zr system alloyed with hafnium and erbium. This is due to the coagulation of Al₃(Sc, Zr, Hf) particles, size of which increases from 13 nm to about 10–30 nm. The best complex of strength and plastic properties has been demonstrated by sheets of 1590-4 (5.53% Mg; 0.14% Sc; 0.1% Zr; 0.1% Er; 0.1% Hf) alloy after two-stage heat treatment at 370 °C (8 h) + 440 °C (4 h).
The research was carried out at the expense of the grant of the Russian Science Foundation No. 22-19-00810-P. Available at: https://rscf.ru/project/22-19-00810/.

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