[en] TiAl based alloys prepared by induction melting with nominal compositions Ti-(37.5-41)Al-(3.5-4)Nb-1Mo-0.1B-xC (at.%), where carbon content x is ranging from 3 to 7 at.%, were characterised by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction analysis (XRD) and elemental LECO analysers of light elements (O, N and C). Morphology and volume fraction of coexisting phases are quantitatively analysed using computerised image analyser. The effect of carbon content on Vickers microhardness and hardness of the alloys is evaluated and discussed. The microstructure of the alloys consists of fine-grained lamellar matrix with elongated Ti₂AlC particles dispersed in the whole volume of the ingots. The volume fraction of the carbide particles increases with the carbon content of the studied alloys from 8 to 18 vol.%. The average Vickers hardness of the ingots doesn’t show the significant variations with their carbon content, but the hardness considerably exceeds the average values in the surface regions where the small rod shape particles are densely distributed in the matrix. (paper)