OBRABOTKAMETALLOV Vol. 26 No. 1 2024 125 MATERIAL SCIENCE Study of evolution of microstructure and mechanical properties in aluminum alloy 1570 with the addition of 0.5 % hafnium Igor Zorin 1, 2, a, *, Evgenii Aryshenskii 1, 2, b, Aleksandr Drits 1, c, Sergey Konovalov 1, 2, c 1 Samara National Research University named after S.P. Korolev, 34 Moskovskoe Shosse, Samara, 443086, Russian Federation 2 Siberian State Industrial University, 42 Kirova str., Novokuznetsk, 654007, Russian Federation a https://orcid.org/0000-0001-9349-2494, zorin.ia@ssau.ru; b https://orcid.org/0000-0003-3875-7749, arishenskiy_ev@sibsiu.ru; c https://orcid.org/0000-0002-9468-8736, alexander.drits@samara-metallurg.ru; d https://orcid.org/0000-0003-4809-8660, konovalov@sibsiu.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2024 vol. 26 no. 1 pp. 113–128 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2024-26.1-113-128 ART I CLE I NFO Article history: Received: 18 October 2023 Revised: 25 October 2023 Accepted: 20 November 2023 Available online: 15 March 2024 Keywords: Aluminum alloys Scandium Hafnium Microstructure Intermetallic compounds Mechanical properties Heat treatment Transmission microscopy Funding The study was supported by a grant of the Russian Science Foundation, project No. 22-29-01506, https://rscf. ru/project/22-29-01506/ Acknowledgements The work was carried out using the equipment of the Center for Collective Use “Technologies and Materials of the National Research University “BelSU”. ABSTRACT Introduction. Aluminum alloys are in high demand with the aerospace industry. From the viewpoint of various performance characteristic combinations, high-magnesium aluminum alloys with the addition of transition metals, such as Zr and Sc, are among the most future-oriented alloys. Alloy 1570 is one of the most popular in this group. Recent studies demonstrated the positive eff ect of 0.5 % hafnium addition on as-cast structure. Study objective is to study the eff ect of the addition of 0.5% hafnium on the structure and properties of aluminum alloy 1570 during thermomechanical treatment. The study addresses the eff ect of cold rolling, homogenization, and recrystallization annealing on mechanical properties and microstructure of the specimens from alloy 1570 and similar alloy with 0.5 wt. % hafnium addition. Study methodology: for the study, ingots were cast from alloy 1570 with and without additions of 0.5 wt. % of hafnium. The resulting ingots were homogenized for 4 h at 440 °С, followed fi rst by hot rolling and then cold rolling. Cold-rolled specimens were annealed at temperatures 340 °С to 530 °С with a holding time of 3 hours. The homogenized, cold-rolled, and annealed specimens were examined using transmission and light microscopy. In addition, homogenized and cold-rolled specimens were subjected to uniaxial tensile tests to determine the mechanical properties of the studied alloy. Results and discussion. It is revealed that in an alloy containing hafnium, after homogenization annealing, there is a slight decrease in the average particle size and an increase in its total proportion in comparison with alloy 1570. In general, 0.5 % hafnium addition does not signifi cantly aff ect the mechanical properties. The number of nanoparticles in both alloys increases, as does the yield strength compared to the as-cast state. When heated, both alloys demonstrate an increase in plasticity and a decrease in strength characteristics. Studies of the annealing eff ect on the grain structure of the studied alloys showed that hafnium increases the tendency of alloy 1570 to recrystallize. However, additional research is required to determine the reasons for this phenomenon. For citation: Zorin I.A., Aryshenskii E.V., Drits A.M., Konovalov S.V. Study of evolution of microstructure and mechanical properties in aluminum alloy 1570 with the addition of 0.5 % hafnium. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2024, vol. 26, no. 1, pp. 113–128. DOI: 10.17212/1994-6309-2024-26.1-113-128. (In Russian). ______ * Corresponding author Zorin Igor A., Master’s Degree student Samara National Research University named after S.P. Korolev, 34 Moskovskoe Shosse, 443086, Samara, Russian Federation Tel.: +7 927 731-03-85, e-mail: zorin.ia@ssau.ru
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