Synchronization effect through incorporation of trace elements (B and La) to enhance high-temperature oxidation performance of Ti6Al4V fabricated via additive manufacturing

Abstract

The superiority of additively manufactured titanium alloys on the preparation of exotic components makes it extensively applied to aero-engine applications. However, the most significant challenges of aero-engine titanium alloys are the prolonged exposure to high-temperature oxidation. Improving the high temperature oxidation performance is urgently required. This study explores the effect of 0.2 wt% B and 0.1 wt% La element co-doping on the microstructure of additively manufactured Ti6Al4V, and investigates its oxidation behavior and the stability of its mechanical properties after oxidation at high temperatures (600 °C–700 °C) for 96 h. The experimental results demonstrate the synergistic effect of the co-doping of the two elements: grain refinement reduced from 1.13 ± 0.26 μm to 0.51 ± 0.12 μm and high temperature oxidation performance was significantly enhanced. Moreover, the La₂O₃ in the samples effectively prevents the grain extension at high temperatures for short durations and consequently stabilizes the mechanical performance.