СУЧАСНІ ПІДХОДИ ДО ЗНИЖЕННЯ ВМІСТУ СКАНДІЮ У ВИСОКОМІЦНИХ СПЛАВАХ СИСТЕМИ Al–Mg: Procesi littâ, 2026, Vol 1 (163), 3-11

• Date: 2026
• Main Authors: Нарівський, А.В., Поливода, С.Л., Семенко, А.Ю., Твердохвалов, В.О.
• Format: Article
• Language: Ukrainian
• Published: National Academy of Sciences of Ukraine, Physical-Technological Institute of Metals and Alloys of NAS of Ukraine 2026
• Subjects: сплави системи Al–Mg; модифікування; мікролегування; скандій; ітрій; цирконій; рідкісноземельні метали; дисперсійне зміцнення
• Online Access: https://plit-periodical.org.ua/index.php/plit/article/view/305
• Journal Title: Casting Processes

The article presents a comprehensive review of modern approaches to solving the problem of reducing the content of the scandium deficient modifier in high-strength aluminum alloys of the Al–Mg system using the example of the deformable alloys 1570 or 1545. Scandium is one of the most effective microalloying elements, which ensures the formation of coherent dispersed particles of Al3Sc, which contribute to grain refinement, suppression of recrystallization and a significant increase in the mechanical properties of high-strength aluminum alloys. At the same time, the high cost of scandium limits its wide industrial application, which makes it urgent to find solutions for its, at least, partial replacement, without a noticeable loss of advantages from its addition. Based on the analysis of modern literary sources, the possibilities of partial or complete replacement of scandium due to microalloying with rare-earth and transition metals, in particular yttrium, erbium, lanthanum, as well as zirconium and indium, are considered. It is shown that yttrium and erbium, like scandium, are capable of forming coherent intermetallic phases with the L12 structure, which provide dispersion strengthening and stabilization of the microstructure. Particular attention is paid to the role of zirconium, which in combination with scandium forms thermally stable Al3(Sc,Zr) particles, which allows to significantly reduce the Sc content without significant loss of strength characteristics. The prospects of complex alloying of Sc–Y–Zr systems as an effective approach to optimizing the ratio of mechanical properties and cost of the Al-Mg alloy are substantiated. It is shown that reducing the scandium content while maintaining high strength, ductility and thermal stability opens up wide opportunities for the application of such alloys in the aviation, shipbuilding and transport industries.