Regularities of Structure Formation in AA2024 Alloy During High-Intensity Plastic Deformation Under Conditions of Adhesion-Diffusion Friction Interaction

The results of model experimental studies of structural-phase changes in an AA2024 aluminum alloy after friction with a counter-body of a complex configuration are presented. The peculiarities of formation of the transfer layer structure in the material after friction stir processing and after frictional interaction, followed by the material extrusion from the friction zone, are revealed. The experiments show that the structure formed during frictional interaction significantly varies in different areas depending on the distance to the counter-body. After the frictional contact, accompanied by the material extrusion from the contact zone, a structure of a solid solution based on aluminum and secondary phase particles is formed, whose grain size is similar to that formed after friction stir welding. The main differences between the structures formed by the friction stir processing and intensive frictional interaction consist in the morphology and distribution of the secondary-phase particles.