[en] This study is concerned with the microstructural analysis and the improvement of hardness and wear resistance of SiC/Ti-6Al-4V surface composites fabricated by high-energy electron beam. The mixtures of SiC, SiC+TiC, or SiC+Ti powders and CaF₂ flux were deposited on a Ti-6Al-4V substrate, and then electron beam was irradiated on these mixtures. In the specimens processed with flux addition, the surface composite layers of 1.7-2.1 mm in thickness were homogeneously formed without defects, and contained a large amount (over 44 vol.%) of precipitates such as Ti₅Si₃ and TiC in the martensitic matrix. This microstructural modification including the formation of hard precipitates and hardened matrix in the surface composite layers could be explained from a Ti-Si-C ternary phase diagram, and greatly improved hardness and wear resistance 2 and 5-25 times higher than the Ti alloy substrate, respectively. These findings suggested that high-energy electron beam irradiation was useful for the development of Ti-base surface composites with improved hardness and wear properties