Tribocorrosion of biomedical Ti-Nb-Ta alloys fabricated by directed energy deposition using elemental powders

Abstract

In this study, Ti-xNb-3Ta alloys were fabricated in situ by directed energy deposition from elemental powders for different Nb content (x = 16 or 28 wt%) and different laser power (600 or 800 W). Advanced characterization methods were employed to assess the homogeneity of the samples, identify phases, and characterize the microstructure of the fabricated alloys. Corrosion and tribocorrosion (fretting wear) tests were conducted in serum-containing buffer to simulate body fluid conditions. Higher laser power (800 W) produced pore-free microstructures. The alloy with 28 wt% Nb demonstrated superior corrosion and tribocorrosion resistance due to the formation of a stable β−phase and protective oxide layers. Thus, this alloy is a promising candidate for load-bearing biomedical implants, offering improved durability.