JSC “Arconic SMZ”, Samara, Russia:

V. V. Yashin, Manager, e-mail: Vasiliy.Yashin@arconic.com

I. A. Latushkin, Leading Specialist, e-mail: Ilya.Latushkin@arconic.com

South Ural State University, Chelyabinsk, Russia:
S. V. Rushchits, Professor, Department of Materials Science and Physics and Chemistry of Materials

Samara University, Samara, Russia:
E. V. Aryshensky, Associate Professor of the Department of Metals Technology and Aviation Materials

The rheological properties under hot deformation of 01570 alloy containing scandium and zirconium micro-additives were studied in comparison with alloy AA5182. Hot deformation was performed by uniaxial compression on Gleeble 3800 thermomechanical processes physical simulator at the temperature range of 350–450 ^oС and strain rates of 0.001–10 s^–1. Alloy samples were selected from ingots obtained under industrial conditions and subjected to standard homogenization. It is demonstrated, that alloys flow stresses increase with rate increase and deformation temperature decrease reflecting changes of Zener-Hollomon parameter, describing the temperature-rate deformation mode. At low Zener-Hollomon parameter values, two studied alloys have close flow stress values; at high parameter values 01570 alloy, micro-alloyed with scandium and zirconium, has higher strain resistance compared to AA5182 alloy. This effect is explained by the presence of fine Al₃ (Sc, Zr) intermetallic compounds particles in 01570 alloy, causing dispersion hardening, as well as a higher magnesium content in this alloy. Obtained analytical expressions allow calculating the steady-state flow stresses of the alloys at specified temperature — rate parameters of hot deformation. These expressions application can be recommended for slab rolling practice calculation, being especially true 01570 type alloys, requiring strictly regulated temperature conditions during processing. A computer simulation of 01570 alloy reverse rolling was performed using the obtained analytical expressions with account for this alloy flow stress values. It is shown that the calculated and actual values of the torque on all passes of the reversing rolling coincide with the accuracy sufficient for engineering purposes.

1. Polmear I. Light alloys. From traditional alloys to nanocrystals. Burlington : Elsevier Butterworth-Heinemann, 2006. 421 p.
2. Alabin A. N., Belov N. A., Tabachkova N. Yu., Akopyan T. K. Heat resistant alloys of Al – Zr – Sc system for electrical applications: analysis and optimization of phase composition. Non-ferrous Metals. 2015. No. 2. P. 36–40. DOI: 10.17580/nfm.2015.02.07
3. Davydov V. G., Rostova T. D., Zakharov V. V., Filatov Yu. A., Yelagin V. I. Scientific principles of making an alloying addition of scandium to aluminium alloys. Materials Science and Engineering: A. 2000. Vol. 280. P. 30–36.

4. Zakharov V. V. Effect of scandium on the structure and properties of aluminum alloys. Metal Science and Heat Treatment. 2003. Vol. 45, No. 7–8. P. 246–253.
5. Røyset J., Ryum N. Scandium in aluminium alloys. International Materials Reviews. 2005. Vol. 50, No. 1. P. 19–44.
6. Zakharov V. V. Combined Alloying of Aluminum Alloys with Scandium and Zirconium. Metal Science and Heat Treatment. 2014. Vol. 56, Iss. 5-6. P. 281–286.
7. Filatov Yu. A. Development of ideas about scandium doping of Al – Mg alloys. Technology of Light Alloys. 2015. No. 2. pp. 19–22.
8. Jones M., Humphreys F. Interaction of recrystallization and precipitation: The effect of Al3Sc on the recrystallization behaviour of deformed aluminium. Acta materialia. 2003. Vol. 51. May. P. 2149–2159.
9. Fuller C. B. Temporal evolution of the nanostructure of Al(Sc,Zr) alloys: Part II-coarsening of Al₃(Sc_{1 – x}Zr_x) precipitates. Acta Materialia. 2005. Vol. 53, No. 20. P. 5415–5428.
10. Yin Z. Effeсt of minor Sc and Zr on the miсrostructure and mechanical properties of AlMg based alloys. Materials Science and Engineering: A. 2000. Vol. 280, No. 1. P. 151–155.
11. Filatov Yu. A., Yelagin V. I., Zakharov V. V. New Al – Mg – Sc alloys. Materials Science and Engineering: A. 2000. Vol. 280, Iss. 1. P. 97–101.
12. Huang H., Jiang F., Zhou J., Wei L., Zhong M., Liu X. Hot deformation behavior and microstructural evolution of as-homogenized Al – 6 Mg – 0.4 Mn – 0.25 Sc – 0.1 Zr alloy during compression at elevated temperature. Journal of Alloys and Compounds. 2015. Vol. 644. P. 862–872.
13. Smirnov A. S., Konovalov A. V., Pushin V. G., Uksusnikov A. N., Zvonkov A. A., Zajcev I. M. Peculiarities of the Rheological Behavior for the Al – Mg – Sc – Zr Alloy Under High-Temperature Deformation. Journal of Mate rials Engineering and Performance. 2014. Vol. 23 (12). December. P. 4271–4277.
14. Taendl J., Dikovits M., Polett C. Investigation of the hot deformation behavior of an Al – Mg – Sc – Zr alloy under plane strain condition. Key Engineering Materials. 2014. Vol. 611–612. P. 76–83.
15. Yashin V. V., Aryshenskiy Yu. V., Latushkin I. A., Tepterev M. S. Substantiation of a manufacturing technology of flat rolled products from Al – Mg – Sc based alloys for the aerospace industry. Tsvetnye Metally. 2018. No. 7. P. 75–82.
16. Goetz R. L., Semiatin S. L. The Adiabatic Correction Factor for Deformation Heating. Journal of Materials Engineering and Performance. 2001. Vol. 10 (6). December. P. 711–717.
17. Ling-Yun Qian, Gang Fang, Pan Zeng, Li-Xiao Wang. Correction of flow stress and determination of constitutive constants for hot working of API X100 pipeline steel During the Uniaxial Compression Test. International Journal of Pressure Vessels and Piping. 2015. Vol. 132–133. P. 43–51.
18. Davis J. R. Alloying: Understanding the Basics. Ohio : ASM International, 2001. 647 p.
19. Sellars M., Tegart W. J. McG. Hot Workability. Intern. Metall. Rev. 1972. Vol. 17. P. 1–24.
20. Horiuchi R., Otsuka M. Mechanism of the High Temperature Creep of Aluminum-Magnesium Alloys. Transactions of the Japan Institute of Metals. 1972. Vol. 13. P. 284–293.