Effect of processing parameters on the mechanical properties and microstructure of the dissimilar aluminum alloys of AA7475 and AA6061

Abstract

Friction stir welding (FSW) is widely used in automobile and aerospace industries to join light metal through higher plastic deformation rates. Because joining of dissimilar light metal is very difficult to join via fusion welding In this work, the friction stir welding (FSW) was successfully fabricate to join dissimilar aluminum alloys of AA7475 and AA6061, and revealed that tensile strength and hardness increased with increasing tool rotation. The maximum tensile strength and the % strain at SZ were observed 247.41 MPa and 18.24%at TRS 1200 rpm and TS 105 mm/min, respectively, and the higher microhardness (127 HV) at SZ was perceived at TRS 1000 rpm and TS 90 mm/min. The microstructure in the stir zone was substantially finer with higher tool rotation than the low TRS. The big and deep dimples can be seen in the FSWed part at 1000 rpm, whereas equiaxed fine dimples can be seen at TRS of 1200 rpm.