Wuhan Textile University, Wuhan, China ; Vladimir State University named after Alexander and Nikolay Stoletovs,
Vladimir, Russia ; National University of Science and Technology MISiS, Moscow, Russia

V. B. Deev, Professor of School of Mechanical Engineering and Automation¹, Chief Researcher², Professor of the Metal Forming Department³, 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 Technology of Functional and Structural Materials, Doctor of Technical Sciences, Associate Professor, e-mail: eprusov@mail.ru

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

Pacific National University, Khabarovsk, Russia
E. Kh. Ri, Head of Higher School of Industrial Engineering of Polytechnic Institute, Doctor of Technical Sciences, Professor, e-mail: erikri999@mail.ru

The effect of adding sodium from 0.05 to 0.3 wt.% on the change in the size and a morphological modification of primary particles of the Mg₂Si reinforcing phase in the production of cast aluminum matrix composite materials based on the Al – Mg₂Si pseudobinary system was experimentally studied. It has been shown that the modification of composite melts with 0.25 wt.% of Na leads to a significant decrease in the average size of Mg₂Si crystals and a change in morphology from acute-angled to close to round, while simultaneously increasing their total number and improving the uniformity of a distribution over the cross section of the ingot. Based on the comparative tribological tests under conditions of dry sliding friction, it has been found that the modification with 0.25 wt.% of sodium leads to a decrease in the friction coefficient on average from 0.45840 to 0.32308 for Al + 15 wt.% Mg₂Si and from 0.46153 to 0.33582 for Al + 25 wt.% Mg₂Si, while mass wear of the samples decreased from 0.0357 to 0.0077 g (15 wt.% Mg₂Si) and from 0.3731 to 0.0163 g (25 wt.% Mg₂Si). The samples of composites with the addition of a modifier in all cases were characterized by less scattering in the values of the friction coefficient. The results obtained expand the prospects for the practical use of aluminum matrix composite materials with endogenous reinforcing phases of a crystallization origin.

This research was funded by the Russian Science Foundation (Project № 20-19-00687-П, https://rscf.ru/project/23-19-45019/)

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