OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 1 2024 c Fig. 5. Mechanical properties of 1570 and 1570–0.5Hf sheets: а) yield strength, σ0.2, MPa; b) ultimate strength, σв, MPa; c) relative elongation, δ, % a b annealing at a temperature of 530 °C (fi gure 4), which improves the mechanical properties. On the other hand, in an alloy with hafnium after recrystallization, a decrease in the average grain size is observed, which also has a benefi cial eff ect on strength. Conclusion After conducting the study, the following conclusions can be made: 1. The TEM results after homogenization showed that annealing in a 1570-0.5Hf alloy led to a reduction in the average size of nanoparticles and an increase in its overall portion compared to the 1570 alloy. However, this does not have a signifi cant eff ect on the diff erence in mechanical properties in homogenized states. 2. The addition of 0.5 wt. % hafnium content increases the tendency of the 1570 alloy to recrystallize during high-temperature treatment. However, further studies are required to understand the causes of this eff ect. Regardless of whether there is recrystallization in the 1570-0.5Hf alloy, both studied alloys demonstrate similar strengthparameters associatedwith the average grain size decrease after recrystallization. Recrystallization can also have an additional modifying eff ect on the size of the cast structure. References 1. Kaibyshev R., Avtokratova E., Sitdikov O. Mechanical properties of an Al-Mg-Sc alloy subjected to intense plastic straining. Materials Science Forum, 2010, vol. 638–642, pp. 1952–1958. DOI: 10.4028/www. scientifi c.net/MSF.638-642.1952.
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