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通过恒速移动线偏振飞秒激光焦点在镍-钛(NiTi)合金表面制备出了多孔微结构.实验结果表明,通过逐步改变入射的激光能量,在样品表面可以形成羽毛状条纹和簇状多孔等多种不同的新颖微结构.当激光能量为400μJ时,实验观测到了规则空间排列的多孔微细结构.X射线衍射(XRD)分析表明,样品经不同能量的飞秒激光加工后,样品表面仍然可以保持其原始的晶体结构,但表面晶粒已明显被细化.X射线光电子能谱(XPS)显示,飞秒激光处理后样品表面的Ni/Ti比值也发生了显著变化,且Ni的氧化明显.当激光能量为400μJ时,加工表面的成分被证实主要由二氧化钛和少量被氧化的Ni组成.
Porous microstructures were fabricated on a NiTi alloy surface by moving a linearly polarized femtosecond laser at a constant rate.The experimental results show that feathery stripes and tufted pores can be formed on the sample surface by gradually changing the incident laser energy And other novel microstructures.When the laser energy is 400μJ, the porous microstructure with regular arrangement in space is observed experimentally.XRD analysis shows that the sample surface is still processed by femtosecond laser with different energy The original crystal structure can be maintained, but the surface grains have been obviously refined.X-ray photoelectron spectroscopy (XPS) shows that the Ni / Ti ratio of the sample surface also changes significantly after the femtosecond laser treatment, and the oxidation of Ni Obviously, when the laser energy is 400 μJ, the composition of the machined surface is confirmed to consist mainly of titanium dioxide and a small amount of oxidized Ni.