A high-entropy alloy composite (HEAC) was fabricated from AlCoCrFeNi 2.1 using additive manufacturing with C, Ti, and O doping. This synthesis transformed the microstructure from lamellar eutectic to equiaxed grains with a petal-like morphology, reduced texture intensity, and refined grain size. Doping induced ordering in the BCC phase, promoting nanoparticle precipitation within the B2 matrix and the in‑situ formation of core-shell Al 2O 3@TiC ceramic particles. These microstructural changes collectively enhanced the alloy's mechanical and tribological performance. Compared to the undoped AlCoCrFeNi 2.1, the HEAC exhibits a 60.6% increase in yield strength, maintains a fracture strain of 28.8%, and achieves a 40% reduction in wear rate. These gains arise from the synergistic contributions of solid solution strengthening, nanoprecipitation, and load transfer.