DOI: 10.52150/2522-9117-2026-40-013
Z. V. Sazanishvili1,*, Ph. D. (Tech.), Assoc. Prof., ORCID 0000-0003-4138-9238
N. O. Rott1, Ph. D. (Tech.), Assoc. Prof., ORCID 0000-0002-3839-6405
1 Dnipro University of Technology
* Corresponding author: sazanishvili.z.v@nmu.one
PREDICTING THE YIELD STRENGTH OF ALUMINUM ALLOYS
OF THE AL–MG–SC–ZR SYSTEM, TAKING INTO ACCOUNT
GRAIN AND DISPERSE STRENGTHENING
Abstract. The modern development of mechanical engineering, transport, and aerospace technology is driving demand for lightweight structural materials with high mechanical properties and corrosion resistance. In this context, Al–Mg aluminum alloys are promising due to their combination of low density, high strength characteristics, and manufacturability. At the same time, during the casting of aluminum alloy billets, there is a tendency for them to form a coarse-grained structure, segregation, and porosity, which negatively affects the yield strength. Therefore, it is important to develop approaches to controlling the microstructure and predicting the mechanical properties of cast alloys. The aim of this work is to study the patterns of formation of the mechanical properties of Al–Mg alloys, microalloyed with Sc and Zr and modified with SiC nanoparticles, as well as to develop a combined approach to predicting the yield strength, taking into account the main strengthening mechanisms. The object of the study is to predict the yield strength of Al–6Mg alloys in different structural states, namely after casting, thermal and thermo-mechanical treatment. Experimental studies included metallographic analysis, scanning electron microscopy with EDS, and tensile testing. It was shown that the initial cast alloy has a coarse-grained structure (400…500 μm) and a yield strength of 150…200 MPa. Microalloying with Sc and Zr ensures the formation of Al₃(Sc,Zr) particles, grain refinement to 250…300 μm, and an increase in σt to 270…310 MPa. The additional introduction of SiC nanoparticles in combination with thermal and thermo-mechanical treatment allows the grain size to be reduced to 100…150 μm and the yield strength to be increased to 350…400 MPa. A combined approach was used to predict σt, taking into account grain, solid solution, dispersion, and deformation strengthening. The calculated values of the yield strength are in good agreement with the experimental ones (the deviation does not exceed 5…7%). The results obtained confirm the possibility of using microstructural parameters to predict the mechanical properties of cast aluminum alloys and can be applied at the stage of designing new materials and technological modes.
Key words: aluminum alloys, microstructure, grain refinement, yield strength, strengthening mechanisms, grain boundary strengthening, dispersion strengthening.
For citation: Sazanishvili, Z. V. & Rott, N. O. (2026). Predicting the yield strength of aluminum alloys of the Al–Mg–Sc–Zr system, taking into account grain and disperse strengthening. Fundamental and applied problems of ferrous metallurgy, 40, 213-225. https://doi.org/10.52150/2522-9117-2026-40-013
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Рукопис надійшов до редакції / Received 21.01.2026
Рекомендовано до друку / Accepted 28.05.2026
Опубліковано / Published 30.05.2026
