The Microstructure, Texture and Mechanical Properties of Friction Stir Welded Aluminum Alloy
Résumé
The microstructure and texture of 7075˗T6 FSW weld with optimal parameters were investigated using optical microscopy, electron back scatter diffraction and neutron diffraction. The mechanical properties were also characterized through microhardness, nanoindentation and ultrasonic tests. The friction stir welding was performed at a nominal rotational speed of 1400 rpm and a traverse speed of 60 mm/min. The nugget zone contained fine, equiaxed and fully recrystallized grains. The texture of the base material mainly consisted of Cube and rotated Goss components. However in the nugget zone, the dominant texture components were B and B ̅ among common shear orientations. Elastic modulus was measured by ultrasonic and nanoindentation methods. The ultrasonic one has the main advantageous to be nondestructive, easy, inexpensive and fast. A little increase of Young modulus is observed in nugget zone compared to base metal.
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