飞秒激光诱导钛合金表面形貌变化的规律

Rule of Morphology Variation of Ti Alloy Surface Induced by Femtosecond Lasers

研究了飞秒激光诱导的钛合金表面微纳结构随激光能量密度和脉冲个数的变化规律,并给出了微纳结构的扫描电子显微镜图。研究结果表明,钛合金表面微纳结构的演化主要经过4个阶段,依次为无激光诱导周期表面结构阶段、经典条纹结构阶段、经典与非经典条纹结构并存阶段和微驼峰结构阶段。进一步的研究表明,非经典条纹的周期随着激光能量密度或脉冲个数的增加而增加。

The variation rule of micro-nano structures on titanium alloy surface induced by femtosecond lasers as afunction of the laser energy density and pulse number is investigated, and the scanning electron microscope imagesof these micro-nano structures are shown. The research results indicate that the evolution of micro-nano structure onthe titanium alloy surface mainly includes four phases, in the order of no-laser-induced periodic surface structurephase, classical ripple structure phase, classical and non-classical ripple structure coexisting phase, and micro-humpstructure phase. Further research indicates that non-classical ripple cycle increases with the increase of laser energydensity or pulse number.