Ti-6Al-4V合金表面微纳米结构的超快激光制备及其反射光谱响应

Preparation and Reflection Spectra Response of Ti-6Al-4V Alloy Surface with Ultrafast Laser Micro-Nano-Structuring

利用单束飞秒激光直接烧蚀技术在钛合金Ti-6Al-4V表面上大面积制备一致的微纳米结构,实现了金属表面光学性质的极大改变。在不同加工参数下获得了3类不同的特征表面结构,如亚微米波纹结构、波纹覆盖的微凸起结构以及多孔结构,并且这3类表面结构特征分别对应着不同的视觉效果,使得钛合金表面分别展现出"彩色"、"蓝色"和"黑色"。初步探讨了不同表面结构特征的形成原因,以及该结构在改变金属表面光学性质中的作用。

Large area uniform micro-nanostructures are fabricated by single-beam femtosecond laser ablating titanium alloy Ti-6Al-4V surface. These micro-nanostructuring metal surfaces show a great change of their optical properties. Three significantly different surface structures,such as sub-micron ripple structures,ripple-covered bulge structure and the micro-porous structure,are obtained by controlling the processing parameters. These three types of surface structure,which correspond to different visual effects,make the titanium alloy exhibit“rainbow-like color”,“blue” and “black”,respectively. The formation mechanisms of these surface structures,as well as the roles of these structures in changing metal-surface optical properties are also discussed.