Abstract
The effect of combined technology of ECAE-drawing on features of ultrafine-grained (UFG) structure formation in aluminum alloy А0 is considered. Deformation by the proposed and existing schemes is conducted at room temperature with the number of passes equal to four. It is shown that ECAE-drawing leads to more significant refinement of the structure of pure aluminum compared with traditional drawing. The grains obtained are equiaxed in shape, and their size lies in the range from 0.7 to 0.8 μm. It is also established that aluminum wire strength increases after four passes by almost a factor of three. Ultimate breaking strength and yield strength increase from 145 to 400 MPa (the absolute increase is 255 MPa) and from 100 to 224 MPa (the absolute increase is 114 MPa) respectively, relative elongation is reduced by 7%, and reduction of area is reduced by 5%. It is found that after deformation by the ECAE-drawing method wire has an increased reserve of ductility compared with the traditional drawing process that makes it possible to accomplish subsequent treatment without intermediate annealing.
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