Abstract
The paper is devoted to the study of the structure of AA2024 alloy samples of different thicknesses. The samples were obtained during friction stir processing by a tool without pin and with different configurations of the grooves. The investigations were carried out using optical microscopy. The samples were obtained on laboratory equipment for friction stir welding and processing. The studies indicate that changes in the configuration of grooves in the surface of the tool can change the depth of the stir zone by up to a factor of 1.2–1.4 times, with similar changes in the depth of the heat-affected zone (HAZ) and thermo-mechanical action zone (TMAZ). The average grain size in the stir zone for processing with two tool types was about 1.5–2.5 µm for samples obtained using tool A and 3–5 μm for samples obtained using tool B.
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