National University of Science and Technology MISIS, Metal Forming Department, Moscow, Russia

K. A. Tsydenov, Engineer of the Research Project, e-mail: kirillcydenov@yandex.ru
N. A. Belov, Chief Researcher, Doctor of Technical Sciences

Ishlinsky Institute for Problems in Mechanics, the Russian Academy of Sciences, Moscow, Russia
O. O. Shcherbakova, Senior Researcher, Candidate of Technical Sciences
T. I. Muraveva, Researcher

Using cold rolled sheets as an example, the study investigated the effect of iron, silicon, magnesium and zinc on the structure and mechanical properties of alloy Al – 2 Cu – 1.5 Mn. At the first stage, by graphite mold casting, the authors produced ingots from two experimental alloys: Al – 2 Cu – 1.5 Mn and Al – 2 Cu –1.5 Mn – 1 Mg – 1 Zn –0.5 Fe – 0.4 Si% (wt.) with sizes of 10×40×180 mm. Then the ingots were rolled on a hot rolling mill to a thickness of 2 mm at 400 oС. Afterwards, hot rolled sheets were annealed at 350 ^oС during 3 h, and rolled on a cold rolling mill to a thickness of 0.5 mm. The microstructure of the samples cut from ingots and sheets was studied with light and scanning electron microscopes. To assess the effect of heat treatment on the structure and physical and mechanical properties, the authors carried out multi-stage annealing processes of sheets and ingots from the experimental alloys in a range of temperatures from 300 to 500 ^oС with an interval of 50 oС. After every annealing stage, the authors measured hardness and specific electric conductivity of the samples. Tensile strength, yield strength and relative elongation of cold rolled sheets were determined by a tensile test method using a universal testing machine. The study showed that adding such elements as magnesium, zinc, iron and silicon into a base alloy resulted in a significant change in the structure and phase composition, but no decrease of mechanical properties of cold rolled sheets annealed at 350 ^oC and 400 ^oC due to a uniform distribution of eutectic particles, whose size was 2–5 μm. The authors demonstrated a possibility in principle to use various secondary raw materials for producing the base alloy, requiring no homogenization or annealing.
The research was funded by the Russian Science Foundation, grant No. RSF 20-19-00249-P.

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