THE FORMATION OF TITANIUM ALUMINIDES ON ALUMINUM SURFACES BY CO2-LASER ALLOYING

The formation of titanium aluminides on Al surface was examined by CO2 laser alloying of preplaced Al and Ti powders. By changing the composition of the mixture of Al and Ti and laser irradiating parameters, condition optimization had been achieved to obtain the most reasonable alloyed layer. This synthesized alloyed layer was confirmed to be TiAl3 by X-ray diffraction and energy dispersive X-ray analyses. The maximum Vickers hardness exhibited about 450 HV and the improvement of wear resistance owing to the surface alloyed layer was recognized by the abrasion test.