The National University of Science and Technology “MISIS”, Moscow, Russia
N. О. Korotkova, Junior Researcher of the Laboratory of Hybrid Nanostructured Materials, Candidate of Technical Sciences, e-mail: darkhopex@mail.ru

Abylkas Saginov Karaganda Technical University, Karaganda, Republic of Kazakhstan
Т. Zh. Sultanbek, Doctoral Student at the Department of Nanotechnology and Metallurgy, e-mail: togzhan-sultanbek@mail.ru

Ishlinsky Institute for Problems in Mechanics RAS, Moscow, Russia.
О. О. Shcherbakova, Senior Researcher, Candidate of Technical Sciences, e-mail: scherbakovaoo@mail.ru
T. I. Muraveva, Researcher

The effect of thermomechanical treatment during cold and hot rolling of a strip with a relative compression ratio of 77% made of Al – 4% Ca – 2% Mn alloy obtained by casting into an electromagnetic mold has been studied by computational and experimental methods. It is shown that the tested thermomechanical treatment mode during cold rolling makes it possible to reduce the electrical resistivity by almost 3 times compared to the cast state, while reducing hardness by 20 units. It is established that the tested hot rolling scheme leads to an increase in deformation hardening. Experimental methods have confirmed the formation in the structure of the compound Al10CaMn2 of secondary origin with a size of ~ 500 nm during the decomposition of (Al) by Mn during homogenizing annealing of the strip. It is shown that even with high-temperature treatment, the dimension of secondary dispersoids is preserved. The kinetics of decomposition of (Al) by Mn during isothermal exposure up to 24 hours inclusive at a temperature of 350 оC of an alloy of Al – 4% Ca – 2% Mn with a relative degree of compression of 77% in hot- and cold-rolled states has been studied. A comparative analysis of the mechanical properties of cold–rolled 0.5 mm thick strips made of Al – 4% Ca — 2 % Mn and A3003 alloys (obtained by two-roll continuous casting with melt ejection) has been carried out. It was found that a strip made of Al – 4% Ca – 2% Mn alloy has a strength of 260 MPa, and a strip made A3003 alloy has a strength of 230 MPa with a comparable ductility of 4.9 and 4.0%, respectively. The achieved level of electrical resistance in the Al – 4 % Ca – 2 % Mn alloy (43.3 MOhm·mm/m) at 77% compression is comparable to the level of the hard-drawn A3003 alloy (43.0 MOhm·mm/m) at 75% compression.
The research was carried out at the expense of the grant of the Russian Science Foundation No. 22-79-00106, https://rscf.ru/project/22-79-00106/.

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