Abstract:Hardness testing, microstructural characterization, and creep aging forming experiments were conducted to investigate the impact of laser shock peening (LSP) treatment on the creep aging behavior of 2195 Al-Li alloy and to evaluate its effect on the springback of single-curved components formed through creep aging. The results indicate that, compared to the creep-aged alloy without LSP treatment, the hardness of the creep-aged alloy with LSP treatment is increased by approximately 22%. Grain size is notably reduced from the surface to the middle layer of the plate, with the greatest decrement in surface layer (49 μm) and the least in the middle layer (4 μm). The T1 precipitate phase in the creep-aged alloy with LSP treatment exhibits a denser distribution, greater quantity, and finer grain size, compared with that without LSP treatment. Furthermore, the springback ratio of creep-aged sheets subjected to LSP treatment is significantly lower than that of untreated sheets, decreasing by about 37.6%. The enhancement in hardness is attributed to fine grain strengthening and substantial precipitation strengthening induced by LSP. The reduction in springback is ascribed to the increased creep deformation resulting from the combined effect of the compressive stress on the concave surface of the plate during bending and the residual compressive stress generated by LSP treatment.