Materials removal mechanism in laser-assisted grinding of SiC fibre-reinforced titanium alloy composite

Abstract

Silicon carbide fibre-reinforced titanium matrix composites are promising materials for lightweight and high-strength applications. However, their unique properties make them extremely difficult to machine. The present investigation proposes a laser-assisted grinding method to address this challenge and reveals distinct deformation mechanisms of the reinforced SiC fibres and titanium matrix by analysing the monitored machining process, surface properties, subsurface microstructure, and nanoscale deformation characteristics. It achieves improved surface integrity and enhanced machinability, attributed to the softening effect induced by additional thermal loads. This phenomenon transitions the SiC fibres from brittle states to semi-ductile conditions, facilitating fracture and improving overall machinability.