The composite Ti-Co alloy cladding layer (20% Stellite6+ 80% Ti) is well combined with the Ti-6Al-4V substrate (the micro-shear strength is up to 615 MPa). Because of the low Co content and abundant β stable elements, the main phases of the cladding layer are solid solution β-Ti and CrTi₄ without intermetallic compounds. 80% of the grains are smaller than 30 μm in diameter. During the heat preservation and cooling processes, the β-Ti separation reaction takes place, which implies that the β′ phase precipitates as the black dispersed particles. The hardness of the cladding layer is increased by approximately 80 HV, and the wear loss is reduced by 38%. The increase in the hardness and wear resistance is mainly due to the solid solution strengthening of β-Ti solid solution, fine grain strengthening, and the diffusion strengthening of the second phase β′.