Association of foundrymen and Metallurgists of Belarus, Minsk, Republic of Belarus

E. I. Marukovich, Doctor of Technical Sciences, Professor, Academician of National Academy of Sciences of Belarus, e-mail: maruko46@mail.ru

V. Yu. Stetsenko, Doctor of Technical Sciences, e-mail: stetsenko.52@bk.ru

Samara State Technical University, Samara, Russia
K. V. Nikitin, Dean of the Faculty of Mechanical Engineering, Metallurgy and Transport, Doctor of Technical Sciences, Professor, e-mail: kvn-6411@mail.ru

Belarusian-Russian University, Mogilev, Republic of Belarus
A. V. Stetsenko, Master of Science, e-mail: stetsenko.52@bk.ru

The effect of structural heredity during the melting of silumin can be explained from the perspective of nanostructural crystallization of casting alloys. According to the nanostructural theory of metal melts, liquid silumins are nanostructural systems consisting mainly of elementary nanocrystals of aluminum, silicon and their free atoms. The main crystallizing phases of silumins are primary and eutectic microcrystals of alpha-phases and silicon, the crystallization of which is a nanostructural process. At first, structure-forming nanocrystals are formed from elementary nanocrystals and free atoms, and then crystallization centers are formed from them. Primary and eutectic microcrystals of alpha-phases and silicon are formed from crystallization centers, structure-forming nanocrystals and free atoms. Based on the nanostructural crystallization of silumins, mechanisms for preserving structural information during their melting have been developed. These mechanisms are determined by the stability of the crystallization centers of primary and eutectic microcrystals of alpha-phases and silicon at temperatures above the liquidus temperature. Based on nanostructural reactions, it is shown that this stability depends on the concentration of adsorbed hydrogen atoms at the crystallization centers of primary and eutectic alpha-phase microcrystals and the concentration of adsorbed oxygen atoms at the crystallization centers of primary and eutectic silicon microcrystals. The higher these concentrations, the less stable the crystallization centers of primary and eutectic microcrystals of alpha-phases and silicon in silumin melts. With an increase in overheating and (or) the holding time of silumin melts, the concentration of adsorbed hydrogen and oxygen atoms in them increases. This leads to the decay of the crystallization centers of primary and eutectic microcrystals of aplha-phases and silicon according to the Rehbinder effect and a decrease in the stability of structural heredity during the melting of silumins.

1. Nikitin V. I., Nikitin K. V. Heredity in cast alloys. Moscow : Mashinostroenie-1, 2005. 474 p.
2. Prigunova A. G., Petrov S. S. A hereditary influence of the melt on silumin structure and properties. Tsvetnye Metally. 1992. No. 2. pp. 59–63.
3. Marukovich E. I., Stetsenko V. Yu. Casting of silumins with nanostructure eutectic silicon. The 66 th World Foundry Congress. Istanbul. 2004. pp. 1349–1354.
4. Marukovich E. I., Stetsenko V. Yu. Production of castings of hypereutectic silumin by means of casting by quenching hardening. Litiyo i Metallurgiya. 2005. No. 2. pp. 142–144.
5. Marukovich E. I., Stetsenko V. Yu. Heredity in hypereutectic silumins. Nasledstvennost v litejnyh processah : Тrudy VII Mezhdunarodnogo nauchnotekhnicheskogo simpoziuma. Samara. SamGTU. 2008. pp. 75–80.
6. Nikitin K. V., Nikitin V. I., Timoshkin I. Yu. Quality control of cast products from aluminum alloys based on the phenomenon of structural heredity. Мoscow : Radunitsa, 2015. 227 p.
7. Deev V. B., Selyanin I. F., Ponomareva K. V., Yudin A. S. et al. Fast cooling of aluminum alloys in casting with a gasifying core. Steel in Translation. 2014. Vol. 44, No. 4. pp. 253–254.
8. Marukovich E. I., Stetsenko V. Yu. Nanostructural theory of metal melts. Litiyo i Metallurgiya. 2020. No. 3. pp. 7–9.
9. Marukovich E. I., Stetsenko V. Yu., Stetsenko А. V. Nanostructured crystallization of casting alloys. Litiyo i Metallurgiya. 2022. No. 3. pp. 13–19.
10. Nikitin V. I., Nikitin K. V. Classification of modifiers for the production of cast and wrought alloys. Metallurgiya mashinostroeniya. 2020. No. 6. pp. 8–17.
11. Marukovich E. I., Stetsenko V. Yu. Modifying of alloys. Minsk : Belorusskaya nauka, 2009. 192 p.
12. Zhang J. et al. Study on dual modification of Al – 17 % Si alloys by structural heredity. Metals. 2015. Vol. 5. pp. 1112–1126.
13. Li D. et al. Microstructure heredity and high yield strength design of fine grained Al – Si – Mg alloys. Materials Reports. 2021. Vol. 35, Iss. 9. pp. 9003–9008.
14. Brodova I. G. et al. Initial melts as basis for formation of structure and properties of aluminium alloys. Yekaterinburg : UrO RAN. 2005. 369 p.
15. Deev V. B. Production of sealed aluminum alloys from secondary materials. Мoscow : Flinta; Nauka. 2006. 217 p.
16. Kurdyumov A. V. et al. Production of castings from non-ferrous metal alloys. Мoscow : MISIS. 2011. 614 p.
17. Constants of metals interaction with gases. In: Kolachev B. A., Levinskij Yu. V. (Eds.). Мoscow : Metallurgiya, 1987. 367p.
18. Physico chemical properties of oxides. Ed. by Samsonova G. V. Мoscow: Metallurgiya, 1978. 471 p.