Influence of Copper, Rare Earth Metals, and Iron on the Change in the Shape of Primary Intermetallic Compounds in an Aluminium Alloy During Cooling and Solidification of the Melt in a Constant Magnetic Field

О. V. Seredenko, V. О. Seredenko

Physico-Technological Institute of Metals and Alloys, NAS of Ukraine, 34/1 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 17.12.2020. Download: PDF

Rare earth metals (REM) in aluminium alloys improve their properties. These alloys are promising for the transport industry, aviation, space, military technologies and electronics. At increased temperatures, thanks to their low specific weight, they are perspective of replacing parts from titanium, cast iron, steel, and copper. In such thermal operate conditions, inclusions of the primary intermetallides are the most stable in comparison with strengthened by solid solution disruption and formation of branched eutectic, and this determines tendency increasing of REM concentration in alloys. One of the main reasons for containment REM additives in aluminium alloys is a significant enlargement of primary intermetallides—more than 100 $\mu$m, which acquire a faceting, needle and cruciform shapes. Investigations is carried out on a multicomponent Al–Cu–REM–Mn–Ti–Fe–Zn–Si alloy, with an average Cu content of 3.7% wt. and addition of 13% wt. REM alloy. The aluminium alloy is cooled and solidified at a rate of 10 K/s. In the structure of the alloy, the primary intermetallides are observed with faceting, wave contours, and such, which contain cracks. In the case of flat surfaces, in comparison with the wave surfaces of the intermetallic inclusions, the rise of the concentration range of all components, except for Mn, take place. The concentrations of Cu, REM, and Fe are changed in the most significant way. Under constant magnetic field action with flux density 0.1 T on the cooled and solidified alloy, the change in morphology of the inclusions with faceting to wave contours accompanied by the most insensitive Fe content arising on the intermetallides’ surfaces. In addition to the mathematical planning of the experiment (a second two-factor experiment with equal duplications of the experiments), equations of regressions, which characterized the influence of the concentration of Cu, REM, and Fe, as well as the magnetic field on the Fe concentration on the intermetallic inclusions’ surface are obtained. As found, the most influential factor is the magnetic field, and the content of rare-earth metals and Cu is in 4.7 and 3.8 times weaker, respectively. In the range of variation of the iron content in the alloy treated by a magnetic field no effect of this impurity on the Fe concentration on the intermetallic surface is found. It is revealed that, under the influence of the field, the behaviour of the Fe impurity becomes similar to the modifier of primary intermetallic compounds and its accumulation on the surface of inclusions is accompanied by the loss of faceting by the crystals.

Key words: Al–Cu–REM alloy, primary intermetallides, experiment mathematical planning, solidification, magnetic field.



PACS: 61.25.Mv, 61.72.Mm, 61.72.S-, 61.72.Yx, 81.30.Fb, 81.40.Wx

Citation: О. V. Seredenko and V. О. Seredenko, Influence of Copper, Rare Earth Metals, and Iron on the Change in the Shape of Primary Intermetallic Compounds in an Aluminium Alloy During Cooling and Solidification of the Melt in a Constant Magnetic Field, Metallofiz. Noveishie Tekhnol., 43, No. 7: 971—984 (2021) (in Ukrainian)

  1. V. A. Gnatush and V. S. Doroshenko, Metall i Lityo Ukrainy, 310-311, Nos. 3-4: 25 (2019) (in Russian). Crossref
  2. Y. A. Gorbunov, J. Siberian Federal Univ., Ing. Techn., 5, No. 8: 636 (2015).
  3. Z. C. Sims, O. R. Rios, D. Weiss, P. E. A. Turchi, A. Perron, J. R. I. Lee, T. T. Li, J. A. Hammons, M. Bagge-Hansen, T. M. Willey, K. An, Y. Chen, A. H. King, and S. K. McCall, Materials Horizons, Iss. 6: 9 (2017). Crossref
  4. V. V. Kaminskii, S. A. Petrovich, and V. A. Lipin, J. Mining Institute, 233: 512 (2018). Crossref
  5. N. A. Terentyev, Issledovanie i Razrabotka Liteynykh Tekhnologiy pri Poluchenii Dispersno-Uprochnyonnykh Alyuminievykh Splavov [Research and Development of Casting Technologies for the Production of Dispersion-Hardened Aluminium Alloys] (Thesis of Disser. for Cand. Techn. Sci.) (Krasnoyarsk: Siberian Federal University: 2017) (in Russian).
  6. N. A. Aristova and I. F. Kolobnev, Termicheskaya Obrabotka Liteynykh Alyuminievykh Splavov [Heat Treatment of Foundry Aluminium Alloys] (Moscow: Metallurgiya: 1977) (in Russian).
  7. F. Czerwinski, J. Mater. Sci., 55, No. 12: 24 (2020). Crossref
  8. H. C. Liao, C. Liu, C. Lu, and Q. G. Wang, Inv. J. Cast Met. Res., 28, Iss. 4: 213 (2015). Crossref
  9. I. P. Volchok, A. A. Mityaev, R. A. Frolov, K. N. Loza, V. V. Klochikhin, and V. V. Lukinov, Stroitelstvo, Materialovedenie, Mashinostroenie: Starodubovskie Chteniya, 90: 64 (2016) (in Russian).
  10. Ye. L. Skuybeda, Lityo i Metallurgiya, No. 4: 42 (2013) (in Russian).
  11. A. V. Khvan, Optimizatsiya Fazovogo Sostava Vysokotekhnologichnykh Alyuminiyevykh Splavov s Kompozitnoy Strukturoy na Osnove Ce- i Ca-Soderzhashchikh Evtektik [Optimization of the Phase Composition of High-Tech Aluminium Alloys with a Composite Structure Based on Ce- and Ca- Containing Eutectics] (Thesis of Disser. for Cand. Techn. Sci.) (Moscow: National University of Science and Technology 'MISIS': 2008) (in Russian).
  12. Gao-ren Huang, Yi-meng Sun, Li Zhang, and Yu-lin Liu, J. Mater. Eng., 46, Iss. 3: 105 (2018) (in Chinese). Crossref
  13. V. M. Fedorov, Yu. M. Ponomarenko, A. M. Diskin, and Z. V. Makarova, Tekhnologiya Lyogkikh Splavov, No. 9: 14 (1983) (in Russian).
  14. E. A. Naumova, Razrabotka Nauchnykh Osnov Legirovaniya Alyuminievykh Splavov Evtekticheskogo Tipa Kaltsiem [Development of the Scientific Basis for the Alloying of Eutectic-Type Aluminium Alloys with Calcium] (Thesis of Disser. for Dr. Phys.-Math. Sci.) (Moscow: National University of Science and Technology 'MISiS': 2019 (in Russian).
  15. I. Brodova, J. Siberian Federal Univ., Ing. Techn., 4, No. 8: 519 (2015) (in Russian). Crossref
  16. V. A. Efimov, G. A. Anisovich, and V. N. Babich, Spetsialnye Sposoby Litya: Spravochnik [Special Methods of Casting: Handbook] (Moscow: Mashinostroenie: 1991) (in Russian).
  17. A. V. Dolmatov, Vliyanie Obrabotki Alyuminiyevykh Rasplavov Uprugimi Nizkochastotnymi Kolebaniyami na Strukturu i Svoystva Litogo Metalla [Influence of Treatment of Aluminium Melts by Elastic Low-Frequency Vibrations on the Structure and Properties of Cast Metal] (Thesis of Disser. for Cand. Techn. Sci.) (Yekaterinburg: GU Institute of Metallurgy of RAS: 2006) (in Russian).
  18. D. G. Eskin and J. Mi, Solidification Processing of Metallic Alloys under External Fields (Cham: Springer Nature Switzerland AG: 2018).
  19. X. Li, Z. Ren, A. Gagnoud, O. Budebkova, A. Bojarevics, and Y. Fautrelle, Journal of ISRI, 19, Supl. 1: 9 (2012) (in Chinese).
  20. D. Du, J. C. Haley, A. Dong, Y. Fautrelle, D. Shu, G. Zhu, X. Li, D. Sun, and E. J. Lavernia, Mater. Des., 181: 107923 (2019). Crossref
  21. X. Li, Y. Fautrelle, Z. Ren, A. Gagnoud, Y. Zhane, and C. Esling, J. Cryst. Growth, 318, No. 1: 23 (2011). Crossref
  22. D. E. Ovsienko, Zarozhdenye i Rost Kristallov iz Rasplava [The Nucleation and Growth of Crystals from a Melt] (Kiev: Naukova Dumka: 1994) (in Russian).
  23. V. N. Kanishchev, Perekhodnye Protsessy Napravlennoy Kristallizatsii pri Vyrashchivanii Kristallov iz Rasplava [Transient Processes of Directional Crystallization when Growing Crystals from a Melt] (Thesis of Disser. for Dr. Techn. Sci.) (Kharkov: Institute for Single Crystals of the N.A.S. of Ukraine: 2014) (in Russian).
  24. V. A. Shalomeev, Metalurgiya, 2: 73 (2013) (in Russian).
  25. Y. Shen, Z. Ren, X. Li, W. Renand, and Y. Xi, J. Cryst. Growth, 336, No. 1: 67 (2011). Crossref
  26. S. Shuai, X. Lin, W. Xiao, J. Yu, J. Wang, and Z. Ren, Acta Metallurgica Sinica, 54, Iss. 6: 918 (2018) (in Chinese). Crossref
  27. M. Wu, T. Liu, M. Dong, J. Sun, S. Dong, and Q. Wang, J. Appl. Phys., 121: 064901 (2017). Crossref
  28. T. Zheng, B. Zhou, Y. Zhong, J. Wang, S. Shuai, Z. Ren, F. Debray, and E. Beaugnon, Sci. Rep., 9: 266 (2019). Crossref
  29. F. S. Novik and Ya. B. Arsov, Optimizatsiya Protsessov Tekhnologii Metallov Metodami Planirovaniya Eksperimentov [Optimization of Metal Technology Processes by Methods of Planning Experiments] (Moscow: Mashinostroenie; Sofiya: Tekhnika: 1980) (in Russian).