Influence of nanosecond laser-induced features on Ti6Al4V for bio-tribology applications

Modifying the surface properties of a material offers new possibilities for enhancing the functional capabilities of a material. Surface texturing is one such process explored by researchers worldwide for various industry applications. In this study, nanosecond laser surface texturing (LST) was performed on Ti-6Al-4V surfaces using a solid-state laser at varying laser and texture parameters. The effects of laser texturing on various micro/nano-mechanical properties of the material have been studied. Initially, a study of the laser-matter interaction was conducted, focusing on thermal influences on grain size, microstrcuture, and nano-mechanical properties. After the fabrication of the textured surfaces, contact angles on the textured surfaces were measured. Finally, an assessment of the bio-tribological performance of textured surfaces was conducted using cross-shear wear mode testing against ultra-high molecular weight polyethylene (UHMWPE), mimicking the interaction between the metallic femoral head and the polymer acetabular liner in hip joint implants for simulating initial contact mode conditions. The lower frictional characteristics and superior wear resistance of the textured surfaces have been observed compared to the untextured surfaces under a bio-fluid immersed environment.