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ArticleName Deformation behavior of 1565ch alloy during hot uniaxial upsetting
DOI 10.17580/tsm.2019.02.10
ArticleAuthor Rushchits S. V., Akhmedyanov A. M., Drits A. M., Nuzhdin V. N.

South Ural State University, Chelyabinsk, Russia:

S. V. Rushchits, Professor of the Department of Material Science and Physics and Chemistry of Materials
A. M. Akhmedyanov, Head of the Physical Simulation of Thermomechanical Processing Laboratory


JSC Arconic SMZ, Moscow, Russia:
A. M. Drits, Director for Business Development and New Technologies, e-mail:
V. N. Nuzhdin, Manager for New Technologies


The paper presents results of physical modelling of the process of hot deformation of casted and homogenized 1565ch aluminum alloy with chemical composition: Al – 5.4% Mg – 0.80% Mn – 0.68% Zn – 0.17% Fe – 0.12% Si – 0.09% Cr – 0.09% Zr (wt.%). Hot deformation by uniaxial compression of cylindrical samples in the temperature range of 350–500 oС and strain rates in the range of 0.001–10 s–1 were carried out on thermomechanical simulator Gleeble 3800. The indicated ranges of temperature and strain rate contain the ranges that can be regarded as typical for the extrusion process of the alloy under consideration. The horizontal plateaus on the obtained flow stress curves bear evidence of dynamical recovery processes running during the deformation. The steady-state stresses rise with the increase of strain rate and the decrease of deformation temperature. It is clarified that the steady-state stresses in the alloy with casted and homogenized structure appear to be somewhat lower than in the alloy having structure that was preliminarily hot-deformed (e.g. by rolling). However, this difference is not so tangible, as it doesn’t exceed 7%. In the region of intermediate values of module-compensated steady-state stresses (1.5·10–3 < σs/G < 4.7·10–3) the strain rate is directly connected with the stress by the exponential law with the energy of activation Q = 138.3 kJ/mol and the exponent n = 4.3. The obtained estimates of the parameters of the power law show that the process that limits the rate of hot deformation in the region of intermediate stresses is the diffusion-controlled motion of dislocations. The index of strain rate sensitivity m takes on a value of 0.23, which is the necessary condition of the alloy’s high ductility under tensile tests. In the region of high values of the steady-state stresses we observed sudden drop in index of strain rate sensitivity — this is accounted for the alteration of the deformation processes that determine the strain rate. The decrease of the strain rate sensitivity in the region of low values of the steady-state stresses is explained by the approach of the stress values to the threshold level, required for breakaway of dislocations from incoherent inclusions present in the alloy. An empirical expression has been obtained, that can be used for the prediction of steady-state stress values in accordance with given thermal and strain rate parameters of the deformation. A deformation map of the 1565ch alloy has been plotted; it can be used as a tool for selection of the optimal operating conditions for the extrusion process.

keywords Hot deformation, physical modelling, extrusion, 1565ch aluminum alloy

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