On the basis of the demand for lightweight and high-strength high-temperature structural materials for aeroengines, a dense TiAl alloy ingot was prepared by hot isostatic pressing of TNM prealloyed powder. The TNM alloy bar was subsequently fabricated via hot extrusion at 1 300 ℃ with an extrusion ratio of 5, and the microstructure and mechanical properties of the hot isostatic pressed (HIPed) and extruded TNM alloys were subsequently analysed. The results show that the microstructure of the TNM alloy transforms from a near-γ microstructure into a duplex microstructure after extrusion. Among them, the fine lamellar colonies mainly originate from the α→α2 +γ phase transformation during the cooling process after extrusion. The γ phase comprises two distinct morphologies: fine equiaxed and elongated grains. The former is formed through recrystallization, whereas the latter are incomplete recrystallized grains. A statistical analysis of recrystallization of the extruded alloy is conducted via GOS mapping, revealing that the recrystallized volume fraction of the alloy is 87.8%. Furthermore, the {0001} basal texture of the α2 phase was found after extrusion. Finally, the tensile properties of the HIPed and extruded TNM alloys at room temperature were tested. The strength and plasticity of the alloys increase by 56.43% and 250%, respectively, after extrusion.