Hubei Key Laboratory of Digital Textile Equipment, Wuhan Textile University, Wuhan, China¹ ; Zhejiang Wenyuan Intelligent Technology Co., Xinchang, China² ; Vladimir State University, Vladimir, Russia³

V. B. Deev, Professor^{1, 2}, Chief Researcher³, Doctor of Technical Sciences, Professor, e-mail: deev.vb@mail.ru

Vladimir State University, Vladimir, Russia
Е. S. Prusov, Professor of the Department of Functional and Constructional Materials Technology, Doctor of Technical Sciences, Associate Professor, e-mail: eprusov@mail.ru

Pacific National University, Khabarovsk, Russia
E. Kh. Ri, Head of the Higher School of Industrial Engineering of the Polytechnic Institute, Doctor of Technical Sciences, Professor, e-mail: erikri999@mail.ru

Hubei Key Laboratory of Digital Textile Equipment, Wuhan Textile University, Wuhan, China
Mei Shunqi, Director, PhD, Professor, e-mail: meishunqi@vip.sina.com

The influence of calcium modifying additive in the amount from 0.05 to 0.3 wt.% on the microstructure formation and change of tribological properties of cast composite materials based on the pseudo-binary Al – Mg₂Si system (15 and 25 wt.%) has been studied. It is shown that with the increase of calcium content in Al – 15Mg₂Si composites, the average size of Mg₂Si reinforcing particles (measured by Feret diameter) decreases slightly from 32.69 μm at 0.05 wt.% Ca to 30.13 μm at 0.25 wt.% Ca; however, the degree of particle distribution uniformity in the composite structure improves significantly (from 0.69 to 0.58, respectively). In the Al – 25Mg₂Si composites at 0.25 wt.% Ca, the average Feret diameter of Mg₂Si particles is approximately 30 μm, with a roundness index of 0.48 and a distribution uniformity index of 0.33, which is quite a good value. Further increase of Ca content up to 0.3 wt.% leads to an increase in the average size of the Mg2Si particles up to 35.16 μm and a deterioration of the distribution uniformity index to 0.41. According to the results of tribological tests on the pin-on-disc scheme in a pair with steel in conditions of dry friction, the friction coefficient and mass wear of the samples of Al – 15Mg₂Si cast aluminum matrix composites modified with calcium (0.25 wt.% Ca) averaged 0.383 and 0.0071 g, respectively; for Al – 25Mg₂Si under the same conditions, it was 0.423 and 0.0051 g. At the same time, in the unmodified state for Al – 15Mg₂Si, mass wear was 0.0357 g at a friction coefficient of 0.4667, and for Al – 25Mg₂Si it was 0.0131 g and 0.4623, respectively. The results confirm that calcium modification allows to significantly improve the microstructure of cast aluminum matrix composites of Al – Mg₂Si system, which provides increased wear resistance and expands the possibilities for their application in conditions of intensive friction.

The research was funded by the Russian Science Foundation (Project № 20-19-00687-П, https://rscf.ru/project/23-19-45019/).

1. Han M., Wu Y., Zong X., Shen Y. et al. Lightweight single-phase Al-based complex concentrated alloy with high specific strength. Nature Communications. 2024. Vol. 15. 7102.
2. Yang T., Cao B. X., Zhang T. L., Zhao Y. L. et al. Chemically complex intermetallic alloys: A new frontier for innovative structural materials. Materials Today. 2022. Vol. 52. pp. 161–174.
3. Li Q., Qiao Z., Bao X., Fan C. et al. Effect of intermetallic compounds on the microstructure, mechanical properties, and tribological behaviors of pure aluminum by adding high-entropy alloy. Journal of Materials Engineering and Performance. 2022. Vol. 31. pp. 6697–6710.
4. Zhang W., Xu J. Advanced lightweight materials for Automobiles: A review. Materials & Design. 2022. Vol. 221. 110994.
5. Emadi P., Andilab B., Ravindran C. Engineering lightweight aluminum and magnesium alloys for a sustainable future. Journal of the Indian Institute of Science. 2022. Vol. 102. pp. 405–420.
6. Amirkhanlou S., Ji S. A review on high stiffness aluminum-based composites and bimetallics. Critical Reviews in Solid State and Materials Sciences. 2019. Vol. 45. pp. 1–21.
7. Mavhungu S. T., Akinlabi E., Onitiri M., Varachia F. M. Aluminum matrix composites for industrial use: Advances and Trends. Procedia Manufacturing. 2016. Vol. 7, No. 3. pp. 178–182.
8. Deev V., Prusov E., Rakhuba E. Physical methods of melt proce ssing at production of aluminum alloys and composites: Opportunities and prospects of application. Materials Science Forum. 2019. Vol. 946 MSF. pp. 655–660.
9. Macke A., Schultz B. F., Rohatgi P. Metal matrix composites offer the automotive industry an opportunity to reduce vehicle weight, improve performance. Advanced Materials and Processes. 2012. Vol. 170, Iss. 3. pp. 19–23.
10. Pandee P., Sankanit P., Uthaisangsuk V. Structure-mechanical property relationships of in-situ A356/Al3Zr composites. Materials Science and Engineering: A. 2023. Vol. 866. 144673.
11. Liu X., Liu Y., Huang D., Han Q., Wang X. Tailoring in-situ TiB2 particulates in aluminum matrix composites. Materials Science and Engineering: A. 2017. Vol. 705. pp. 55–61.
12. Pramod S. L., Bakshi S. R., Murty B. S. Aluminum-based cast in situ composites: a review. Journal of Materials Engineering and Performance. 2015. Vol. 24. pp. 2185–2207.
13. Goalakrishnan B., Rajaravi C., Udhayakmar Goikrishnan, Lakshminarayanan P. R. A comparative study on ex-situ & in-situ formed metal matrix composites. Archives of Metallurgy and Materials. 2023. Vol. 68. pp. 171–185.
14. Biswas P., Mondal M. K., Roy H., Mandal D. Microstructural evolution and hardness property of in situ Al – Mg2Si composites using one-step gravity casting method. Canadian Metallurgical Quarterly. 2017. Vol. 56. pp. 340–348.
15. Deev V. B., Prusov E. S., Ri E. H. Microstructural modification of in situ aluminum matrix composites via pulsed electromagnetic processing of crystallizing melt. Non-Ferrous Metals. 2023. No. 1. pp. 36–40.
16. Bhandari R., Mallik M., Mondal M. K. Microstructure evolution and mechanical properties of in situ hypereutectic Al – Mg2Si composites. AIP Conference Proceedings. 2019. Vol. 2162. 020145.
17. Khorshidi R., Honarbakhsh-Raouf A., Mahmudi R. Effect of minor Gd addition on the microstructure and creep behavior of a cast Al – 15Mg2Si in situ composite. Materials Science and Engineering: A. 2018. Vol. 718. pp. 9–18.
18. Si Y. Effect of Pr modification treatment on the microstructure and mechanical properties of cast Al – Mg2Si metal matrix composite. Advanced Materials Research. 2014. Vol. 936. pp. 23–27.
19. Jin Y., Fang H., Wang S., Chen R. et al. Effects of Eu modification and heat treatment on microstructure and mechanical properties of hypereutectic Al – Mg2Si composites. Materials Science and Engineering: A. 2022. Vol. 831. 142227.
20. Deev V., Prusov E., Ri E., Prihodko O. et al. Effect of melt overheating on structure and mechanical properties of Al – Mg – Si cast alloy. Metals. 2021. Vol. 11, Iss. 9. 1353.
21. Vdovin K. N., Dubsky G. A., Deev V. B., Egorova L. G. et al. Influence of a magnetic field on structure formation during the crystallization and physicomechanical properties of aluminum alloys. Russian Journal of Non-Ferrous Metals. 2019. Vol. 60, Iss. 3. pp. 247–252.
22. Deev V. B., Prusov E. S., Ri E. H. Physical methods of processing the melts of metal matrix composites: current state and prospects. Russian Journal of Non-Ferrous Metals. 2022. Vol. 63, Iss. 3. pp. 292–304.
23. Deev V. B., Prusov E. S., Ri E. Kh., Shabaldin I. V. Modification of cast aluminum matrix composite materials with barium. Tsvetnye Metally. 2024. No. 4. pp. 7–12.
24. Deev V. B., Prusov E. S., Ri E. Kh., Shabaldin I. V. Influence of sodium on the structure and properties of aluminum matrix composite materials based on pseudobinary eutectic. Tsvetnye Metally. 2024. No. 5. pp. 50–56.
25. Prusov E. S., Shabaldin I. V., Deev V. B. Quantitative characterization of the microstructure of in situ aluminum matrix composites. Journal of Physics: Conference Series. 2021. Vol. 2131, No. 4. 042040.
26. Zhang J., Fan Z., Wang Y. Q., Zhou B. L. Equilibrium pseudobinary Al – Mg2Si phase diagram. Materials Science and Technology. 2001. Vol. 17, Iss. 5. pp. 494–496.
27. Itkin V. P., Alcock C. B., Van Ekerer P. J., Oonk H. A. J. The Al – Ca (Aluminum-Calcium) System. Bulletin of Alloy Phase Diagrams. 1988. Vol. 9, No. 6. pp. 652–657.
28. Belov N. A., Naumova E. A., Akopyan T. K., Doroshenko V. V. Phase diagram of Al – Ca – Mg – Si system and its application for the design of aluminum alloys with high magnesium conten. Metals. 2017. Vol. 7. 429.
29. Zarif M., Spacil I., Pabel T., Schumacher P., Li J. Effect of Ca and P on the size and morphology of eutectic Mg2Si in high-purity Al – Mg – Si alloys. Metals. 2023. Vol. 13, Iss. 4. 784.
30. Kumari Sreeja S. S., Pillai R. M., Pai B. C. Role of calcium in aluminium based alloys and composites. International Materials Reviews. 2005. Vol. 50, Iss. 4. pp. 216–238.