Siberian Federal University, Krasnoyarsk, Russia:
N. N. Dovzhenko, Professor at the Department of Mechanical Engineering, e-mail: n.dovzhenko@bk.ru
I. N. Dovzhenko, Associate Professor at the Department of Metal Forming
P. O. Yurev, Applied Research Engineer

South Ural State University, Chelyabinsk, Russia:

S. V. Rushchits, Professor at the Department of Materials Science and Physics and Chemistry of Materials

With the help of the Gleeble 3800 system, a study was carried out to understand the deformation behaviour of an experimental alloy Р-1580 sparingly doped with scandium. The alloy was designed by RUSAL UC (United Company) and contains the following doping elements (hereinafter — wt%): Al – 5 Mg – 0.6 Mn – 0.10 Sc – 0.11 Zr. The process involved uniaxial upse tting in the temperature range of 350–450 ^oC and the deformation rate range of 0.01–30 s^–1. For the fixed temperatures of 350, 375, 400, 425 and 450 ^oC and deformation rates of 0.01, 0.1, 1, 10 and 30 s^–1, experimental true stres s true strain curves were obtained for the alloy in view. At lower deformation rates (i.e. 0.01–1.0 s^–1), the flow stresses reach a steady level corresponding to the equilibrium between strain hardening and softening (i. e. reco very) even after slight deformation. Deformation at higher rates (i. e. 10 and 30 s^–1) leads to strain-induced heating of specimens, and as the strain rises the flow stresses drop. After the strain curves were adjusted to allow for the strain-induced heating, they started to look like curves typical of hot deformation controlled by dynamic recovery. These findings are perfectly in line with the popular belief that the combined effect of temperature and deformation rate on the deformation behaviour of metallic materials can be described with Zener-Hollomon parameter. Analytical expressions were derived for the steady flow stresses as a function of Zener-Hollomon parameter. They enable to predict plastic resistance of alloys within a wide range of temperatures and deformation rates. A curve was built that can help predict the rate coefficient as a function of a given temperature-rate regime of deformation.

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