Ural Federal University named after the first President of Russia B. N. Yeltsin, Yekaterinburg, Russia

A. B. Finkelstein, Professor of the Department of Foundry and Strengthening Technologies, Doctor of Technical Sciences, Assosiate Professor, e-mail: avinkel@mail.ru

V. A. Khotinov, Professor of the Department of Heat Treatment and Metal Physics, Doctor of Technical Sciences, Assosiate Professor, e-mail: khotinov@yandex.ru

Miao Jingtao, postgraduate student of the Department of Foundry and Strengthening Technologies, e-mail: miaojingtao22@gmail.com

South Ural State University, Chelyabinsk, Russia

A. P. Pellenen, Associate Professor of the Department of Metal Forming Processes and Machines, Candidate of Technical Sciences

Plastic deformation of cast composites contributes to increasing their mechanical and service properties. Most of the research in this field is devoted to overcoming porosity associated with increased gas saturation, when the reinforcing particles are added into the melt by stirring, and its subsequent sedimentation. The solution to the problem is the use of the in situ lancing technology for the pre-hydrogenated silumin melt with oxygen (forming of a reinforcing component as a result of chemical reactions in the melt). However, the achieved mechanical properties of the composite are low due to a chemically adsorbed hydrogen layer on the surface of Al₂O₃ reinforcing particles. To improve the mechanical properties, the authors used hot rolling. The proven technology provides for rolling cylindrical ingots across the axis with a reduction of up to 63% at a temperature of 550 ^оC. Ingots under rolling with a thickness of 1 mm or less were annealed at a temperature of 380 ^оC. The achieved thickness of the rolled sheets was 0.16 mm. Mechanical tests showed the achieved tensile strength of 250 MPa, which was 25% higher than in the cast billet, and yield strength was 197 MPa, being extremely insignificant, no more than 5% higher. The stress-strain curves showed load oscillations associated with the occurrence of microcracks. However, the latter does not lead to immediate fracture as in the cast state. A comparison of the stress-strain curves of the cast and rolled samples suggested that the observed oscillations were associated with thinning of the hydroxide layer – aluminum oxide on the surface of the reinforcement phase during hot rolling. It is the decrease in a share of combined hydrogen, and not the observed refinement of primary silicon crystals that is the reason for the increase in tensile strength of the composite. In the future, aluminum-matrix composite rolled products may become an alternative to wrought alloys.

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