| Izvleček: | In this study, in situ Al<sub>2</sub>O<sub>3</sub>-reinforced Ti<sub>3</sub>Al composite was fabricated after 8 h of milling and sintering at 850 °C. A mixture of TiO<sub>2</sub> and Al powders were mechanically milled in a planetary mill, cold-compacted and sintered under a protected argon atmosphere. The microstructure and microhardness of the Al<sub>2</sub>O<sub>3</sub> embedded in Ti<sub>3</sub>Al matrix at both room and elevated temperature has been reported. The obtained results showed that the Ti<sub>3</sub>Al/Al<sub>2</sub>O<sub>3</sub> composite was successfully synthesized via the powder metallurgy method. Ti<sub>3</sub>Al phase and Al<sub>2</sub>O<sub>3</sub> particles were formed after 8 h of milling and sintering at 850 °C. The microstructure formation of round and uniformly distributed Al<sub>2</sub>O<sub>3</sub> particles in the Ti<sub>3</sub>Al matrix improved the microhardness of the composite. At normal temperature, the microhardness of the material measured about 11.5 GPa. Meanwhile, at elevated temperatures, from 600 to 800 °C, it decreased from 4.18 GPa to 3.15 GPa.
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