Surface modification of Aluminium alloy (7xxx series) by multipass friction stir processing

Multipass friction stir processing (MP-FSP) is a solid-state surface modification technique, which was developed based on the simple principle of FSW. Aluminium plates were subjected to MP-FSP from 1 14 passes along longitudinal direction with specified process parameters such as rotational speed 1000 rpm and travel 70 mm/min axial force 15 kN. Subsequently, similar had followed by doublepass (DP-FSP) in order help determine effectiveness multipass creating high strength aluminium alloys. Now-a-days extensive research focused various speed, traverse tool design alloys proficiently enhanced material properties. This technique has considered mostly development green technology, energy efficient environment friendly technique. Experimentally proven that Al-Zn-Mg-Sc are characterized through OM, FESEM, DSC, SEM, TEM, mechanical The tensile ductility specimen improved significantly 122.48%, 42.55% respectively, but hardness decline 4.84% compared DP-FSP. due not only for refinement cast dendritic structure eliminate segregation as-cast alloy, also refining grains, uniform distribution Al3Sc hardening precipitates. To aim this work mainly focusing may enhance properties better than DP-FSP useful macroscale applications.