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The effect of additional phases, mainly metal-boride and metal-nitrides, on the microstructure and some mechanical properties of γ-TiAI(55/45)-based titanium aluminides have been investigated. The considerable changes in the microstructure of γ-TiAl-based titanium aluminides were achieved by the addition of metal-boride and nitrides into γ-TiA1 titanium aluminides. Fine and duplex microstructures of γ-TiAl matrix, in which the lamellar phase was dispersed in the equi-axed γ-TiAI matrix grains, were observed by SEM and TEM. After reaction sintering, formation of Ti2N and Ti2AIN phases and simultaniously Cr, Nb and Zr solid solution into γ-TiAl titanium aluminides were confirmed. Especially, NbN addition inhibited the grain growth of matrix and resulted in the increase in bending strength and hardness at room temperature.

Fabrication and Microstructure for Ceramic-reinforced Ti-Al-based Composites.