The study of the evolution of structure formation during rolling of a foil blank, a screw and a longitudinal wedge mill

ІRSTІ 53.43.13                                                                                                №4 (2018г.)

 

Mashekov S.A., Maulenova M.R., Mashekova A.S., Tusupkalieva E.A.  

 

The article presents the results of studies of the influence of the number of passes during the rolling of strips in helical-shaped rolls, as well as single compression when rolling strips on a longitudinal-wedge mill on the parameters of the aluminum alloy 2017 microstructure. A comparative estimation of grain sizes of ultrafine-grained structures after rolling strips in helical-shaped rolls with various passes, and also after rolling in a longitudinal-wedge mill at deformation temperatures of 400 and 450 оС is carried out. The characteristic parameters of the structure of grains and defects are given. The general tendency of evolution of the fine structure of alloy 2017 is established. The nature of the change in the structure of the alloy during rolling parameters in a spiral indicates that the formation of new nanometer grains in accordance with the continuous dynamic recrystallization mechanism. It is shown that a sheet material made of an aluminum alloy 2017 ensures the formation of a uniform ultrafine-grained structure with a grain size of about 240 nm, which leads to an increase in the strength and plastic properties of the alloy.
Key words: Aluminum alloy 2017, rolling, screw-like shafts, intensive plastic deformation, longitudinal-wedge mill, electron microscopy.

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