Surface Modification of a Titanium Alloy with a Fe3Al/Ti3Al Matrix Laser Clad Composite Coating
J-N. Li, C-W. Shi, Z. Wang and B-L. Zhang
A TiC particle-dispersed Al-Fe (Al=30wt.%) matrix composite coating on a Ti-6Al-4V titanium alloy by laser cladding (laser cladding) has been researched by means of scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). Al-Fe was chosen as the matrix of the laser clad composite coating. Experimental results indicated that the (Al-Fe)+TiC laser cladding composite coating significantly improved the wear resistance of the Ti-6Al-4V alloy surface; however, when the mass percent of TiC in the pre-placed coating was above 40wt.%, the microcrack can be formed, decreasing the wear resistance of this coating; this (Al-Fe)+TiC laser cladding coating mainly consisted of Fe3Al, Fe3AlC0.69, Ti3Al and TiC, which exhibited a good performance of the wear resistance.
Keywords: CO2 laser, Ti-6Al-4V, titanium alloy, Al-Fe, TiC, laser cladding, intermetallics, wear resistance