Abstract
The article presents the study of the effect of the number of passes on the parameters of AD31 aluminum alloy microstructure, as well as the effects of the single reduction (aluminum wrought alloys) while rolling of the strips in the helical rolls and on the longitudinal wedge mill. A comparative evaluation of the grain size of ultrafine structures after rolling in the helical rolls and on the longitudinal wedge mill at the deformation temperature of 300 °C is given. The characteristic parameters of the grain and defect structure are presented. It is shown that the uniform ultrafine grain structure with the size of about 730–850 nm was formed in the sheet material made of AD31 aluminum alloy, which led to the increased strength properties of the alloy and preserved good ductility.

Key words
AD31 aluminum alloy, rolling, helical rolls, severe plastic deformation, longitudinal wedge mill, grain size

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