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ArticleName Study of recrystallization kinetics of aluminium alloy 1565ch with low degree of cast structure conditioning
DOI 10.17580/tsm.2021.01.06
ArticleAuthor Yashin V. V., Latushkin I. A., Aryshensky E. V., Chitnaeva E. S.

AO“Arconic SMZ”, Samara, Russia:

V. V. Yashin, Manger, e-mail:
I. A. Latushkin, Lead specialist, e-mail:
E. S. Chitnaeva, Head of Technological improvement, e-mail:

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:


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.

keywords Hot rolling, recrystallization, grain, 1565ch aluminum alloy, microstructure, grain growth, recrystallization nuclei

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