Effect of rotational speed and feed rate on microstructure and mechanical properties of 6061 aluminum alloy manufactured by additive friction stir deposition

Additive friction stir deposition (AFSD) is attractive for its ability to create freeform and fully dense structures without melting solidification. Hence, additive an alternative fusion-based manufacturing technology. In this study, the influence of AFSD parameter (i.e., rotational speed feed rate) on mechanical properties microstructure 6061 aluminum alloy investigated. The as-deposited exhibits a relatively homogeneous with extensive equiaxed grains. Compared feedstock material, ultimate tensile strength decreased 65% from 320 210 MPa. results electron backscatter diffraction indicate that continuous dynamic recrystallization occurs during process. Furthermore, it evidence grain size are positively correlated rate speed, whereas elongation at break decreases increase in speed.