Abstract
The paper investigates the features of the friction stir processing of aluminum-magnesium alloy using tools with a screw pin and with a square section pin. The conducted studies show that during the friction stir process with a tool with a square cross-section pins it is possible to form instabilities during treatment, leading to non-uniform longitudinal movement of the tool and formation of defects. One mechanism for this phenomenon could be contamination of the surface of the aluminum-magnesium alloy treating tool after working on aluminum-silicon alloys, resulting in unstable adhesion contact. This effect is less noticeable for treating by tool with a cylindrical pin. Mechanical properties of the treated material in 1-4 passes remain quite close and the average ultimate tensile strength of the stir zone is 325-335 MPa. The plasticity of the material decreases on average from 33% to 25-30%, but remains at an acceptable level. The average ultimate tensile strength and ductility values are slightly higher when processing with a square-shaped pin tool than when processing with a spiral-shaped pin tool.
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