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Modification of copper alloys with ultrafine powders
- Authors: Malkova M.Y.1, Zadiranov A.N.2, Gerasimova I.N.2, Grusheva T.G.2
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Affiliations:
- Peoples’ Friendship University of Russia (RUDN University)
- State Fire Academy of EMERCOM of Russia
- Issue: Vol 23, No 1 (2022)
- Pages: 57-64
- Section: Articles
- URL: https://journals.rudn.ru/engineering-researches/article/view/31246
- DOI: https://doi.org/10.22363/2312-8143-2022-23-1-57-64
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Abstract
Modification of metal melts by mechanochemically activated ultrafine powders (UDP) makes it possible to obtain ferrous and non-ferrous metal alloys with fundamentally new performance properties due to changes in the structure of metal alloys. The purposes of this work were to analyse the efficiency of the process of modifying copper alloys with ultrafine powders and to develop a special device for introducing a modifier into the melt. Experimental studies of the process of modifying melts of aluminum, silicon and tin bronze with mechanochemically activated UDP of natural graphite, as well as silicon and aluminum oxides with a fraction of -100+0 microns in a concentration of 0.2-0.25 % were carried out. It is shown that the modification of bronze melts by the above-mentioned powders affects the microstructure of alloys, intensively grinding it in comparison with the initial structure. It was found that the reduction in the size of the dendritic cell in comparison with the initial alloy reaches 25%, and the micrograin - 230%. Grain grinding leads to an increase in the mechanical properties of copper alloys, such as Brinell hardness HB, tensile strength σb, elongation δ. For more efficient implementation of the process of modifying metal melts with ultrafine powders, an original design of a device for introducing modifiers into the melt has been developed, characterized by simplicity and cost-effectiveness of execution.
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About the authors
Marianna Yu. Malkova
Peoples’ Friendship University of Russia (RUDN University)
Email: malkova-myu@rudn.ru
ORCID iD: 0000-0002-6939-1658
Doctor of Technical Sciences, Director of the Department of Mechanical Engineering and Instrumentation, Academy of Engineering
6 Miklukho-Maklaya St, Moscow, 117198, Russian FederationAlexander N. Zadiranov
State Fire Academy of EMERCOM of Russia
Email: zadiranov@mail.ru
ORCID iD: 0000-0001-7787-8290
Doctor of Technical Sciences, Professor, Professor of the Department of Combustion Processes and Environmental Safety, Educational and Scientific Complex of Combustion Processes and Environmental Safety
4 Boris Galushkin St, Moscow, 129366, Russian FederationIrina N. Gerasimova
State Fire Academy of EMERCOM of Russia
Email: malviktpp@gmail.com
ORCID iD: 0000-0001-7829-9610
senior lecturer, Department of Combustion Processes and Environmental Safety, Educational and Scientific Complex of Combustion Processes and Environmental Safety
4 Boris Galushkin St, Moscow, 129366, Russian FederationTatiana G. Grusheva
State Fire Academy of EMERCOM of Russia
Author for correspondence.
Email: malviktpp@gmail.com
ORCID iD: 0000-0003-0515-4167
senior lecturer, Department of Combustion Processes and Environmental Safety, Educational and Scientific Complex of Combustion Processes and Environmental Safety
4 Boris Galushkin St, Moscow, 129366, Russian FederationReferences
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