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Effect of Ti/Si Ratio on the Synthesized Products of Laser Ignited Self-propagating High-temperature Synthesis (SHS) in an Al-Ti-Si System
Y.X. LI, P.K. BAI, J.H. Wang, B. Liu, Q. Lu and L.T. JIANG

The production of titanium silicide, from elemental powder compacts was successfully synthesized by laser ignited self-propagating high-temperature synthesis (SHS) of Al-Ti-Si system in this study. Effects of Ti/ Si ratio on adiabatic temperature, the phase composition and microstructure of final products were studied. The results showed that the adiabatic temperature increased with the increasing of Ti/Si ratio. When Ti/Si ratio is 1/2, the polygon-shaped TiSi2 phase with irregular edges was the dominant phase, minor amounts of Ti5Si3 were detected in the final product; when Ti/Si ratio is 1/1, TiSi and Ti5Si3 phases were detected, and the morphology of the product showed the cannular-like and spherical-like shape, respectively; when Ti/Si ratio is 5/3, the lath-like and cobblestone- like shaped Ti5Si3 was identified as the dominant phase in the final product.

Keywords: Nd:YAG laser, laser ignition, self-propagating high-temperature synthesis (SHS), adiabatic temperature, microstructure, phase

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