Investigation of the Effects of Overlapping Passes on Friction Stir Processed Aluminum Alloy 5083

The effect of the number of passes during friction stir processing on the structure and properties of the surface layers of aluminum alloy 5083 is investigated. The alloy is processed by the FSP method with one, two and four passes, after which the tensile strength, the elongation under static tension, the impact energy during dynamic bending and the microhardness are determined. After a single-pass FSP, a significant increase in the elongation of the material is observed. However, with increase in the number of passes, its plasticity decreases slightly, remaining above the initial value. It is shown that after FSP, the microhardness of the alloy increases, and the tensile strength and the impact energy decrease, and these changes become more significant with increase in the number of passes.