Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

► Effects of LSPwC on 3D roughness and mechanical properties of Al6082 are evaluated. ► LSPwC treated specimen's indicated small tendency of the surface texture orientation. ► Peak-to-peak amplitude and wave period of LSPwC-induced craters were analysed. ► Micro-hardness confirmed shock wave effect of up to 800 μm below the surface. ► LSPwC process imparts high compressive residual stresses up to − 407 ± 81 MPa.