Формування дрібнодисперсної структури вторинних алюмінієвих сплавів шляхом рафінування та корекції хімічного складу

• Datum: 2025
• Hauptverfasser: Petrychenko, S. V., Kovalenko, V. V., Byba, E. G., Minitskyi, А. V., Lukianenko, I. V., Minitska, N. V., Yamshinskij, М. М., Barabash, M. Yu.
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Physico- Technological Institute of Metals and Alloys of the NAS of Ukraine 2025
• Schlagworte: вторинні алюмінієві сплави; рециклінг алюмінію; флюсове рафінування; механічні властивості; сплави системи 7xxx
• Online Zugang: https://momjournal.org.ua/index.php/mom/article/view/2025-4-3
• Назва журналу: Metal Science and Treatment of Metals

This work is dedicated to developing a technological basis for optimizing the chemical composition, structure, and mechanical properties of secondary aluminum alloys obtained from the recycling of various types of aluminum scrap, including military and industrial origins. The relevance of this research is driven by the necessity for rational utilization of secondary raw materials, reduced energy consumption, and minimized environmental impact in the production of high-strength structural materials for the aviation and machine-building industries.A remelting technology utilizing a binary NaCl-KCl salt flux system is proposed. This system ensures effective melt refining from non-metallic inclusions, intensifies degassing, and reduces the loss of alloying elements. An approach involving zinc (Zn) alloying is introduced to adjust the chemical composition of the secondary alloy, facilitating the formation of a high-strength Al-Zn-Mg system.It is demonstrated that zinc alloying and additional flux treatment contribute to a reduction of harmful iron (Fe) impurities to 0.36-0.38%, a transformation in the morphology of iron-containing intermetallic phases, and a decrease in residual casting stresses. Metallographic and microstructural analyses confirmed the formation of a more homogeneous, fine-grained cast structure with a reduced defect density. The mechanical properties of the alloy in the as-cast state were determined: an ultimate tensile strength of 140 MPa and an elongation of 5.42%, which corresponds to an intermediate stage of property development prior to subsequent heat treatment.The results confirm the potential of the developed technology as an effective foundation for producing secondary high-strength aluminum alloys with predictable structural and mechanical properties, suitable for practical application in critical structural components for aviation and general machine-building.