Siberian Federal University, Krasnoyarsk, Russia:

V. M. Bespalov, Associate Professor at the Department of Engineering bachelor CDIO, Сandidate of Technical Sciences, Associate Professor, e-mail: vmbespalov@mail.ru
S. B. Sidelnikov, Professor at the Department of Metal Forming, Doctor of Technical Sciences, Professor, e-mail: sbs270359@yandex.ru
V. I. Belokopytov, Associate Professor at the Department of Metal Forming, Сandidate of Technical Sciences, Associate Professor
D. S. Voroshilov, Head of the Department of Metal Forming, Сandidate of Technical Sciences, Associate Professor, e-mail: sibdrug@mail.ru

The results of experimental studies of the properties of an experimental batch of deformed semi-finished products from alloys of the Al – Zr system, made using the methods of combined processing and drawing, are presented. The influence of combined casting, rolling-extrusion and drawing conditions on the mechanical properties and electrical resistivity of deformed semi-finished products for electrical purposes with different zirconium and iron contents is studied. The rational modes of joint hot and cold machining of the alloys under study have been determined, which make it possible to achieve high strength, ductility and electrical conductivity of conductive semi-finished products. The microstructure of the experimental samples was analyzed with a light microscope, the influence of combined casting and rolling-extruding and cold-drawing modes on the metal flow pattern and phase distribution in the structure of rods and wire was established. Temperature tests of an experimental batch of deformed semifinished products after hot and cold machining were carried out in accordance with the international standard IEC 62004–07. The level of heat resistance of manufactured rods and wire when heated to operating temperatures is set. The regularities of the change in the temporary resistance to rupture and the relative elongation of the test samples after temperature tests are determined depending on the different conditions of combined casting, rolling-pressing and cold drawing. Recommendations on the content of alloys and modes of production of rods and wire with a stable structure during heating and a given level of operational properties of cable and conductive semi-finished products were formulated. Application of the technological scheme using the methods of combined casting, rolling-extruding and drawing allows to obtain the required level of strength properties and heat resistance of semi-finished products from aluminum alloys of the Al – Zr system with different iron content.

1. Gorbunov J. A. Development of rolled and cabling-wiring production from aluminum alloys at plants in Russia. Journal of Siberian Federal University. Engineering & Technologies. 2014. Vol. 8, Iss. 7. pp. 938–946.
2. Gorbunov Yu. A. The role and prospects of rare earth metals in the development of physico-mechanical properties and applications of wrought aluminium alloys. Zhurnal Sibirskogo federalnogo universiteta. Seriya: Tekhnika i tekhnologii. 2015. Vol. 8, No. 5. pp. 636–645.
3. Belyi D. I. Aluminium alloys for cable conductors. Kabeli i provoda. 2012. No. 1. pp. 8–15.
4. Peshkov I. B. Aluminium for cable industry: Current status and prospective applications. Kabeli i provoda. 2009. No. 1. pp. 7–9.
5. Bespalov V. M. Combined processing of Al – Zr alloys for making long-length deformed semi-finished products for electrical applications: Abstract of PhD dissertation. Krasnoyarsk, 2015.
6. Understanding the structure and properties of semi-finished products made of Al – Zr alloys with magnesium using the CCRE process. Available at: https://studref.com/519911/tehnika/issledovanie_struktury_svoystv_deformirovannyh_polufabrikatov_poluchennyh_tehnologii_slipp_splavov_si (Accessed: 10.08.2020).
7. IEC 62004–07. Thermal-resistant aluminum alloys wire for overhead line conductor. Copyright International Commission, Geneva, Switzerland. 2007. 13 p.
8. Çadirli E., Tecer H., ahin M., Yilmaz E., Kirindi T. et al. Effect of heat treatments on the microhardness and tensile strength of Al – 0.25 wt. % Zr alloy. Journal of Alloys and Compounds. 2015. Vol. 632. pp. 229–237.
9. Belov N. A. Phase composition of commercial and advanced aluminium alloys. Moscow : Izdatelskiy Dom MISiS, 2010. 509 p.
10. Belov N. A., Alabin A. N., Teleuova A. R. Comparative analysis of alloying additives as applied to the production of heat-resistant aluminum-base wires. Metal Science and Heat Treatment. 2012. Vol. 53, Iss. 9–10. pp. 455–459.

11. Belov N. A., Korotkova N. O., Alabin A. N., Mishurov S. S. Influence of a silicon additive on resistivity and hardness of the Al – 1% Fe – 0,3 % Zr alloy. Russian Journal of Non-Ferrous Metals. 2018. Vol. 59, Iss. 3. pp. 276–283.
12. Zhang J., Wang H., Yi D., Wang B., Wang H. Comparative study of Sc and Er addition on microstructure, mechanical properties, and electrical conductivity of Al – 0,2Zr – based alloy cables. Materials Characterization. 2018. Vol. 145. pp. 126–134.
13. Gao T., Ceguerra A., Breen A., Liu X., Wu Y., Ringer S. Precipitation behaviors of cubic and tetragonal Zr-rich phase in Al – (Si –)Zr alloys. Journal of Alloys and Compounds. 2016. Vol. 674. pp. 125–130.
14. Prokhorov A. Yu., Belov N. A. Melting and casting of conductive aluminium-zirconium alloys in an industrial environment: Process features. Liteyshchik Rossii. 2010. No. 4. pp. 30–34.
15. Grishchenko N. A., Sidelnikov S. B., Gubanov I. Yu. et al. Mechanical properties of aluminium alloys: Monograph. Krasnoyarsk : Sibirskiy Federalnyi universitet, 2012. 196 p.
16. Berngardt V. A., Drozdova T. N., Orelkinа T. A., Sidelnikov S. B., Fedorova O. V. et al. Development of Annealing Conditions wire Rod Alloy of Al – Zr System to Reach Required Properties. Journal of Siberian Federal University Engineering & Technologies. 2014. Vol. 5, Iss. 7. pp. 587–595.
17. Sidelnikov S. B., Dovzhenko N. N., Zagirov N. N. Combined processing of non-ferrous metals and alloys: Monograph. Moscow : MAKS Press, 2005. 343 p.
18. S. B. Sidelnikov, N. N. Dovzhenko, E. S. Lopatina, R. E. Sokolov et al. Machine for continuous casting, rolling and extrusion of non-ferrous metals and alloys. Patent RF, No. 73245. Applied: 25.12.2007. Published: 20.05.2008. Bulletin No. 14.
19. V. I. Belokopytov, S. B. Sidelnikov, I. Yu. Gubanov, A. S. Sidelnikov. Plant for continuous casting and pressing of non-ferrous metals and alloys. Patent RF, No. 2556264. Applied: 10.02.2014. Published: 10.07.2015. Bulletin No. 19.
20. GOST 9450–76 (ST SEV 1195–78). Measurements of microhardness by diamond instruments indentation (incl. Revisions 1, 2). Introduced: 01.01.1977.
21. GOST 7229–76. Cables, wires and cords. Method of measuring electrical resistance of conductors (incl. Revision 1). Introduced: 01.01.1978.