Simulation of CW Laser Controlled Surface Modification of Titanium by Aluminum

In this paper, the process of laser surface modification of titanium by aluminum has been studied using a combination of the thermal equation and diffusion equation. A 2D transient fmite element analysis has been developed to calculate the temperature distribution, the aluminum concentration profile and the melting depth inside titanium material. The obtained results reveal that the melt-solid interface velocity (vm ) as well as the particle diffusion velocity (vp ) plays a major role in determining the resulting diffusion profile. Computations make it possible to control whether to obtain a step-like or smooth diffusion profile, this by selecting the appropriate laser power density, the overlayer thickness and the laser interaction time with the work piece.