Modification of 6061 Aluminum Alloy Plate for Automotive by Friction Stir Processing

The modification of 6061 aluminum alloy plate for automobile were carried out by friction stir processing, and the tensile properties and corrosion resistance at different rotation speeds (300-1 100 r·min^-1) and travel speeds (120-300 mm·min^-1) were studied. The results show that when the travel speed was 300 mm·min^-1, with increasing the rotation speed, the tensile strength and yield strength of 6061 aluminum alloy first increased and then decreased, and the elongation changed with inflection; the self-corrosion potential first moved positively and then negatively; when the rotation speed was 600 r·min^-1, the tensile strength and yield strength were the highest, and the self-corrosion potential was the most positive. When the rotation speed was 600 r·min^-1, with increasing the travel speed, the tensile strength and yield strength of 6061 aluminum alloy increased, the elongation first decreased and then increased; the self-corrosion potential first moved positively and then negatively; when the travel speed was 300 mm·min^-1, the tensile strength and yield strength were the highest, and the self-corrosion potential was the most positive. When the rotation speed and travel speed were 600 r·min^-1 and 300 mm·min^-1, respectively, the tensile properties and corrosion resistance of 6061 aluminum alloy were the best.