Abstract:Ti-Al complex with a network microstructure was successfully fabricated by pressure infiltration. The fabricated Ti-Al complex was investigated and analyzed by OM, XRD, SEM and EDS. The temperature of pressure infiltration was reduced by using Al-Si eutectic alloy instead of pure Al, which can effectively decrease non-diffusion reaction between liquid Al and solid Ti particles. The reaction thickness can be controlled at about 3 μm. The primary reaction product is TiAl₃ intermetallics. As Ti atoms dissolve into the Al-Si liquid phase and Si atoms enrich on the surface of Ti particles, TiSi₂Al is formed in Al phase of Ti-Al complex and outside the surface of Ti-Al reaction layer. The microstructure of the as-extruded Ti-Al complex indicates that the prepared Ti-Al complex possesses a superior deformation capability.

Key words: pressure infiltration; Ti-Al complex; Al-Si eutectic alloy; microstructure