Additively manufactured high entropy alloy with high wear resistance for biomedical implant

Titanium and its alloys play a vital role as implant materials in orthopedic and dental surgery. However, its poor wear resistance limits its application in the medical field. High entropy alloy (HEA) has high wear resistance due to the combined action of high entropy, lattice distortion, and cocktail effects. In this work, TiFeCrCoNi HEA is prepared by Laser powder bed fusion (LPBF) under the protection of high pure Ar gas . The results show the TiFeCrCoNi HEA has mainly FCC phase and a small amount of Hexagonal and Laves phases . Its microhardness is up to 776.3 ± 21.4 H V and is 2.8 times that of pure Ti. Meanwhile, the HEA has a low friction coefficient of 0.1–0.15, which is attributed to high hardness precipitates and grain refinement. The main wear mechanism of the HEA is oxidation wear, adhesive wear , and abrasive wear . In addition, the TiFeCrCoNi HEA also demonstrates good biocompatibility.