Surface microstructuring of aluminum alloy 2024 using femtosecondexcimer laser irradiation

摘要

Surface microstructuring and modification of aluminum alloyn2024-T3 were investigated using a femtosecond pulse laser irradiation.nThe surface micrographs of the scanning electron microscopy werencharacterized as a function of incident laser fluence. The surfacenfeatures ranging from submicrometer to micrometers were developednthrough the variation in laser fluence and laser pulse count. Resultsnindicated that surface patterns were uniquely constructed in ancontrolled use of pulsed laser parameters for the ablation. Two ablationnregimes were found in the logarithmic dependence of the ablated depth onnlaser fluence and two components were attributed to the optical andnenergy penetration. A thermal dynamic model was adopted to analyze thenablation processes, and the theoretical analysis agreed well with thenexperimental results