Moscow Aviation Institute, Moscow, Russia¹ ; Keldysh Research Center, Moscow, Russia²

L. E. Agureev, Candidate of Technical Sciences, Leading Researcher at the Nanotechnology Department^1,2, e-mail: trynano@gmail.com
S. V. Savushkina, Doctor of Technical Sciences, Professor, Researcher at the Nanotechnology Department^1,2

Bauman Moscow State Technical University, Moscow, Russia
G. V. Belov, Doctor of Technical Sciences, Leading Researcher

Moscow Aviation Institute, Moscow, Russia
M. A. Lyakhovetsky, Candidate of Technical Sciences, Associate Professor, Leading Researcher, e-mail: maxim.lyakhovetskiy@mai.ru

The ability to increase the operating temperature of powder aluminum matrix composites by introducing alloying metals (Zr, Cr, Co, Ti, and Cu) and nanoparticles of refractory substances has been studied. The equilibrium composition of the Al – Cr – Zr – Co – Ti – Cu system has been calculated using contemporary modeling techniques for equilibrium processes (jmatro® and HSC®). Calculations indicate the presence of Al, Al₃M (D0₂₃), Al₇Cr, Al₇Cu₂M, and Al₉M₂ phases in aluminum at the sintering temperature, where M is an additive metal. Gibbs energies and equilibrium constants for the formation of intermetallic compounds have been calculated. The intensification of the solid-phase reaction between aluminium and silicon carbide is contingent upon the presence of free carbon within the system Al – Cr – Zr – Co – Ti – Cu evidenced by calculations of the Gibbs energy and equilibrium constant. An aluminum composite Al – Cr – Zr – Co – Ti – Cu modified with SiC and MgAl₂O₄ nanoparticles has been produced through mechanical alloying, hydrostatic pressing, and spark plasma sintering. The next materials were prepared: Al – 0.5%Cr – 0.3%Zr, Al – 0.5%Cr – 0.3%Zr + 0.1% SiC, Al – 0.5%Cr – 0.3%Zr + 0.1 MgAl₂O₄, Al – 0.5%Cr – 0.25%Zr – 0.2%Co – 0.2%Ti – 0.2%Cu, Al – 0.5%Cr – 0.25 Zr – 0.2%Co – 0.2%Ti – 0.2%Cu + 0.1%SiC, Al – 0.5%Cr – 0.25%Zr – 0.2%Co – 0.2%Ti – 0.2%Cu + 0.1%MgAl₂O₄. The microstructure of the samples was analyzed. It was found that the segmentation effect, in which a large inclusion splits into smaller grains, is linked to the formation of intermetallic compounds with different crystalline structures, compositions and stoichiometry. The bending strength and Young’s modulus at different temperatures for Al – Cr – Zr and Al – Cr – Zr – Co – Ti – Cu materials, as well as those modified with aluminum-magnesium spinel and silicon carbide nanoparticles, were measured. The material exhibits high bending strength at 400 °C (up to 191 MPa).

This research was funded by the Ministry of Science and Higher Education of the Russian Federation in the framework of the “Goszadanie”, grant number FSFF-2023–0006.
The authors would like to acknowledge the support received by the employees of the Department of Nanotechnology of JSC “Keldysh Research Center” for assistance in the research and valuable advice.

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