Microstructure and Mechanical Properties of LaB6/Ti-6Al-4V Composites Fabricated by Selective Laser Melting

In this study, TiB + La2O3/Ti-6Al-4V composites were successfully prepared by in situ reaction using selective laser melting technology. The effect of LaB6 content on the fabrication quality, microstructure evolution and mechanical properties composite samples was investigated. results show that relative density sample gradually decreased from 98.56% to 96.57% as increased 0 wt% 3 wt%. With increasing content, precipitates aggregated grew a discrete needle-like structure dendritic structure, before eventually developing cell-like structure. dislocations piled up around La2O3 reinforcements, which impeded motion led enhancement tensile strength samples. Different addition single reinforcement due combined strengthening micrometer-scale nanoscale significantly. Ti-6Al-4V with showed most significant effect. Compared pure sample, gained 35.71% increase hardness 14.5% strength. Additionally, wear volume reduced 47.5%. revealed potential way improve performance titanium alloys additive manufacturing process.