Wuhan Textile University, Wuhan, China¹ ; Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, Russia² ; National University of Science and Technology MISIS, Moscow, Russia³

V. B. Deev, Professor of the School of Mechanical Engineering and Automation¹, Chief Researcher², Professor of the Department of Metal Forming³, Doctor of Technical Sciences, Professor, e-mail: deev.vb@mail.ru

Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, Russia

E. S. Prusov, Associate Professor of the Department of Functional and Constructional Materials Technology, Candidate of Technical Sciences, Associate Professor, e-mail: eprusov@mail.ru

I. V. Shabaldin, Research Assistant of the Department of Functional and Constructional Materials Technology, e-mail: shabaldinivan@mail.ru

Pacific State University, Khabarovsk, Russia

E. Kh. Ri, Head of Higher School of Industrial Engineering, Polytechnic Institute4, Doctor of Technical Sciences, Professor, e-mail: erikri999@mail.ru

The study is aimed at investigating the peculiarities of the formation of the structure and alterations in the tribological properties of cast aluminum matrix composite materials based on the pseudo-binary Al – Mg₂Si system when modified with barium within a range of 0.05–0.25 wt.%. It is demonstrated that the addition of barium from 0.05 to 0.15 wt.% results in a reduction in the sizes of endogenous reinforcing particles Mg₂Si in Al + 15 wt.% Mg₂Si composite materials. There is a noted trend towards decreasing the sizes of Mg₂Si particles to ~19.58 μm, which is 32% less than in the unmodified state. A further increase in the barium content leads to a growth of particle sizes and their non-uniform distribution across the cross-section of the ingot. A similar change in the structure is observed for the Al + 25 wt.% Mg₂Si composite. In this case, the addition of barium induces a morphological transformation of the crystals of the reinforcing phase accompanied by changes in their average sizes depending on the concentration of the modifying additive. It has been established that the modifying treatment of the composites significantly reduces the coefficient of friction and mass wear during dry friction with steel.
The research was funded by the Russian Science Foundation, grant No. 20-19-00687-П, https://rscf.ru/project/23-19-45019/.

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