The TC4-(TiB+TiC) composites were fabricated using selective laser melting (SLM) combined with in-situ reaction sintering, and the effects of B4C content variation on the structure and properties of the composites were investigated. The results show that the bending strength reaches its maximum value of 2 415.2 MPa when the B4C content is 0.5 wt%, which is 19.13% higher than that of TC4 alloy. When the B4C content is 2 wt%, the compressive strength of the composite reaches a maximum value of 1 698.1 MPa, which is 9.14% higher than that of TC4 alloy. The reaction between B4C and Ti during the SLM process can in-situ form TiB and TiC, which synergistically enhance the mechanical properties of the composites. However, an excessive amount of ceramic reinforcement will reduce the plasticity of the composites and deteriorate the bending performance.
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