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Strength Properties of Aluminum Strips Subjected to Complex KOBO Deformation

Aluminum strips were subjected to a new complex KOBO deformation process, comprising joined operations of rolling, compression and extrusion within a single act (pass) under the conditions of cyclic changes of the deformation path. Tensile tests of strips deformed in this way have revealed their potential for attaining high strength properties. Electronomicroscopic observations show that the strips consist of well-recovered ~ 1μm subgrains with a low dislocation density.Clusters of point defects – the presence of which in products obtained through „cold” extrusion by the KOBO method is considered as the reason for the high mechanical properties of metals and alloys [1,2] - were not identified.