AO“Arconic SMZ”, Samara, Russia:

V. V. Yashin, Manger, e-mail: Vasiliy.Yashin@arconic.com
I. A. Latushkin, Lead specialist, e-mail: Ilya.Latushkin@arconic.com
E. S. Chitnaeva, Head of Technological improvement, e-mail: Ekaterina.Chitnaeva@arconic.com

Samara National Research University, Samara, Russia:

E. V. Aryshensky, Assistant Professor at the Process Metallurgy and Aviation Material Science Department, Candidate of Technical Sciences, e-mail: ar-evgenii@yandex.ru

The present study addresses recrystallization process in Al – Mg 1565ch system alloy samples (Russian classification). The samples are taken from cast ingot, produced by continuous casting in DC mold and homogenized based on standard commercial mode. Then the samples were heated to 350–500 ^oC and rolled in lab mill with different process schedules to cover the entire range of temperature and strain rates, applied in rolling. After rolling the samples were annealed at 350, 400 and 450 ^oC, their resultant microstructure was examined by optic microscope. The rate of new grains nucleation, their growth speed, analytical notations, describing recrystallization kinetics, were obtained within the frames of the study to be applied during this alloy recrystallization modelling; the main alloy-specific recrystallization features were identified and compared with alloy АА5182 (classification of American Aluminum Association). It is demonstrated, that 1565ch recrystallization has a number of specific features in case of as-cast structure deformation with low strain levels (ε = 0.14÷0.56): first, high rate of new grains nucleation; second, low grain growth speed to the extent of complete process blocking. Optimal recrystallization temperature is identified as 400 ^oC, at this temperature the process is over 75% complete, the temperature drop (350 ^oC) causes incubation period extension, while recrystallization subsides at recrystallized structure volume of about 30%, in case of temperature rise (450 ^oC) the structure is saturated with fine new grains nuclei, probably, emerging during heating, but due to high intensity of recovery and polygonization, recrystallization driving force drops to zero, the process stops with mixed structure and max recrystallized grains volume of 20%.
This research was funded through a grant by the Russian Science Foundation, Project 18-79-10099.

1. Hirsch J. Aluminium sheet fabrication and processing. Fundamentals of Aluminium Metallurgy : production, processing and applications. 2011. pp. 719–746.
2. Hirsch J. Texture Evolution during Rolling of Aluminum Alloys. Light Metals. Warrendale Proceedings. 2008. Vol. 2008. p. 1071.
3. Schäfer C., Mohles V., Gottstein G. Modeling of texture development during tandem hot rolling of AA3103. Applications of Texture Analysis. 2008. pp. 537–545.
4. Engler O., Löchte L., Karhausen K. F. Modelling of recrystallisation kinetics and texture during the thermo-mechanical processing of aluminium sheets. Materials Science Forum. 2005. Vol. 495. pp. 555–566.
5. Engler O. Simulation of rolling and recrystallization textures in aluminium alloy sheets. Materials Science Forum. 2007. Vol. 550. pp. 23–34.
6. Engler O., Vatne H. E. Modeling the recrystallization textures of aluminum alloys after hot deformation. JOM. 1998. Vol. 50, No. 6. pp. 23–27.
7. Hirsch J. Textures in industrial processes and products. Materials Science Forum. 2012. Vol. 702. pp. 18–25.
8. Golovnin M. A., Iskhakov R. F. Properties formed in aluminium alloys during hot rolling. Materials Science and Physics of Light Alloys, 3^rd International Science School for Young People : Research papers. Yekaterinburg : URFU, 2014. pp. 208–210.
9. Orlov V. К., Drozd V. G., Sarafanov М. А. Rolling of aluminium alloy plates. Proizvodstvo prokata. 2016. No. 4. pp. 11–16.
10. Aryshenskiy E. V., Tepterev M. S., Latushkin I. A. Understanding the effect of iron concentration on the texture of hot-rolled billets made of alloy 3104. Electrical Engineering. Power. Mechanical Engineering : Proceedings of the 1^st International Science Conference among Young Researchers. 2014. pp. 258–261.
11. Yashin V. V., Aryshenskiy V. Yu., 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. pp. 75–82. DOI: 10.17580/tsm.2018.07.12.
12. Hui Z., Libin Y., Dashu P., Gaoyong L. Recrystallization model for hotrolling of 5182 aluminum alloy [J]. Transactions of Nonferrous Metals Society of China. 2001. Vol. 11, No. 3. pp. 382–386.
13. Wells M. A., Samarasekera I. V., Brimacombe J. K., Hawbolt E. B. et al. Modeling the microstructural changes during hot tandem rolling of AA5XXX aluminum alloys: Part I. Microstructural evolution. Metallurgical and Materials Transactions B. 1998. Vol. 29, No. 3. pp. 611–620.
14. Yashin V., Aryshenskii E., Hirsch J., Konovalov S. et al. Study of recrystallization kinetics in AA5182 aluminium alloy after deformation of the as-cast structure. Materials Research Express. 2019. Vol. 6, No. 6. DOI: 10.1088/2053-1591/ab085f.
15. Gorelik S. S., Kaputkina L. M., Dobatkin S. V. Recrystallization of metals and alloys. Moscow : MISiS, 2003. 452 p.
16. Koohbor B. On the influence of rolling path change on static recrystallization behavior of commercial purity aluminum. International Journal of Material Forming. 2014.Vol. 7, No. 1. pp. 53–63.
17. Aryshnskii E. V., Bazhin V. Y., Kawalla R. Strategy of refining the structure of aluminummagnesium alloys by complex microalloying with transition elements during casting and subsequent thermomechanical processing. Non-ferrous Metals. 2019. No. 1. pp. 28–32. DOI: 10.17580/nfm.2019.01.05.
18. Nam A., Aryshenskii E., Kawalla R., Yashin V. et al. Modelling of cooling and recrystallization kinetics during self-annealing of aluminium coils. Materials Science Forum. 2018. Vol. 918. pp. 110–116.
19. Aryshenskiy E. V., Grechnikova A. F., Yashin V. V. Understanding the relationship between the texture components and the anisotropy and the earing behaviour in a hot-rolled billet made of alloy 3104. Electrical Engineering. Power. Mechanical Engineering : Proceedings of the 1^st International Science Conference among Young Researchers. 2014. Vol. 3. pp. 261–264.
20. Humphreys F. J., Hatherly M. Recrystallization and related annealing phenomena. Pergamon : Elsevier, 2012. 520 p.
21. Dalland O., Nes E. Origin of cube texture during hot rolling of commercial Al – Mn – Mg alloys. Acta Materialia. 1996. Vol. 44, No. 4. pp. 1389–1411.
22. Vatne H. E., Nes E., Daaland O. On the formation of cube texture in aluminium. Materials Science Forum. 1994. Vol. 157. pp. 1087–1094.
23. Vatne H. E., Nes E. The origin of recrystallization texture and the concept of micro-growth selection. Scripta Metallurgica et Materialia. 1994. Vol. 30, No. 3. DOI: 10.1016/0956-716X(94)90380-8.
24. Avrami M. Kinetics of phase change. I General theory. The Journal of Chemical Physics. 1939. Vol. 7, No. 12. pp. 1103-1112.
25. GOST 4784–2019. Aluminium and wrought aluminium alloys. Grades. Introduced: 01.09.2019.
26. GOST 21073.2. Non-ferrous metals. Determination of grain size by grain calculation method. Introduced: 30.06.1976.
27. Churyumov A. Yu. Calculating the yield strength and the strain hardening of aluminium alloys based on structural parameters: PhD dissertation. Moscow, 2008.