Siberian Federal University, Krasnoyarsk, Russia

E. G. Partyko, Candidate of Technical Sciences, Senior Researcher, e-mail: elforion@mail.ru
A. A. Kosovich, Candidate of Technical Sciences, Senior Researcher, e-mail: akosovich@sfu-kras.ru
I. V. Kostin, Candidate of Technical Sciences, Associate Professor, e-mail: caster_kos@mail.ru
N. A. Stepanenko, Junior Researcher, e-mail: stepanenko.n.a@yandex.ru

The work was performed at the laboratory on semi-continuous casting unit (SCCU) of the Institute of Non-Ferrous Metals and Materials Science of SFU in order to carry out comparative studies of the modifying ability of Al – 5Ti – 1B ligature and a promising modifying ligature Al –3La – 1.5B. Casting and modification of experimental flat ingots was carried out according to the casting modes, which provide the parameters of the cast workpiece structure as close as possible to the parameters obtained in industrial conditions for ingots with a thickness of at least 300 mm. The paper presents the results of quantitative analysis of the microstructure of Al – 5Ti – 1B and Al – 3La – 1.5B ligatures. The paper shows that when 8079 aluminum alloy is modified with Al – 5Ti – 1B ligature rod at the rate of 0.5–1.5 kg/t metal, the average grain size decreases from 190 to 129 μm and there is a zone of columnar crystals, but at the rate of 2–2.5 kg/t metal, the grain size decreases to 100 and 90 μm, respectively, with the complete absence of columnar crystals zone. The paper shows the results of the experiment on modification with Al – 3La – 1.5B ligature at ligature bar consumption from 0.5–1.5 kg/t metal, where the average size in the obtained ingot samples was from 180 to 100 μm, but at modifier consumption from 2–2.5 kg/t metal the average grain size decreases to 99 and 86 μm, respectively. The paper shows that, according to the results of the experiments, the modifying ligature Al – 3La – 1.5B has better modifying ability in comparison with the ligature Al – 5Ti – 1B regardless of oxide film contamination and higher amount of non-metallic inclusions.

The study was funded by the Russian Science Foundation grant No. 24-29-00053, https://rscf.ru/project/24-29-00053/.

1. Partyko E. G. Research and Improvement of the Degassing Process in the Blank Casting of Aluminum and Its Alloys: Diss. … Candidate of Technical Sciences. Krasnoyarsk, 2023. 164 p.
2. Sidorov A. Yu. Improving the Technology of Production of Large-Sized Flat Ingots from Aluminum Alloys of the 5xxx Series to Reduce Porosity: Diss. ... Candidate of Technical Sciences. Krasnoyarsk, 2021. 120 p.
3. Rozhin A. V. Improving the Processes of Alloying and Modifying Aluminum Alloys: Abstract of the Diss... Candidate of Technical Sciences. Eekaterinburg, 2013. 23 p.
4. Wang Y., Fang C. M., Zhou L., Hashimoto T., Zhou X., Ramasse Q. M., Fan Z. Mechanism for Zr Poisoning of Al –Ti – B Based Grain Refiners. Acta Materialia. 2019. Vol. 164. pp. 428–439.
5. Kostin I. V. Research and Improvement of the Modification Process of Flat Ingots Made of Aluminum Alloys of the 5xxx Series: Diss. ... Candidate of Technical Sciences. Krasnoyarsk, 2018. 160 p.
6. Napalkov V. I., Baranov V. N., Frolov V. F. Aluminum Ligatures: Structure and Purpose. Krasnoyarsk: SFU, 2019. 175 p.
7. Stepanenko N. A., Kulikov B. P., Kosovich A. A., Belyaev S. V., Konstantinov I. L., Partyko E. G., Yuriev P. O. A Comparative Analysis of Technologies for Producing Al – 3Ti – 1B Modifying Master Alloy. Metallurgist. 2023. Vol. 67. pp. 1166–1177.
8. Li D., Cui C., Wang X., Wang Q., Chen C., Liu S. Microstructure Evolution and Enhanced Mechanical Properties of Eutectic Al – Si Die Cast Alloy by Combined Alloying Mg and La. Materials & Design. 2016. Vol. 90. pp. 820–828.
9. Qiu C., Miao S., Li X., Xia X., Ding J., Wang Y., Zhao W. Synergistic Effect of Sr and La on the Microstructure and Mechanical Properties of A356.2 Alloy. Materials & Design. 2017. Vol. 114. pp. 563–571.
10. Jing L., Pan Y., Lu T., Li C., Pi J., Sheng N. Application of Al – 2La – 1B Grain Refiner to Al – 10Si – 0.3Mg Casting Alloy. Journal of Materials Engineering and Performance. 2018. Vol. 27. pp. 2838–2843.
11. Kosovich A. A., Bogdanova T. A., Partyko E. G., Stepanenko N. A. Prospects for Using La-Containing Materials
in Al-Alloys for the Automotive Industry. Youth and Science: Current Problems of Fundamental and Applied Research. Materials of the VI All-Russian National Scientific Conference of Young Scientists. In 3 parts. Pt. 1. Komsomolsk-on-Amur, 2023. pp. 137–140.
12. Hosseinifar M., Malakhov D. V. Effect of Ce and La on Microstructure and Properties of a 6xxx Series Type Aluminum Alloy. Journal of Materials Science. 2008. Vol. 43. pp. 7157–7164.
13. Aluminium-Titanium-Boron (AlTiB). URL: https://www.kbmaffilips.com/aluminium-based/aluminium-titanium-boron/ (Accessed Date: 21.06.2024).
14. AlLa3B1.5 Special Grain Refiner For Al-Si Casting Alloys. URL: https://www.fy-altic.com/aluminum-lanthanumboron/alla3b1-5-special-grain-refiner-for-al-si.html (Accessed Date: 21.06.2024).
15. Napalkov V. I., Makhov S. V., Pozdnyakov A. V. Modification of Aluminum Alloys. Moscow: Izdatelskiy Dom MISiS, 2017. 348 p.