Synthesis and Characterization of Directional Array TiN-Reinforced AlCoCrCuNiTi High-Entropy Alloy Coating by Magnetic-Field-Assisted Laser Cladding.

The directional array TiN-reinforced AlCoCrCuNiTi high-entropy alloy (HEA) coating was designed and the correlative coating was successfully synthesized by magnetic-field-assisted laser cladding on Ti-6Al-4V (TC4) alloy. The effect of the directional array TiN on the phase structure, microstructure, microhardness and wear resistance of HEA coating were investigated methodically. As a result, the HEA coatings are mainly composed of body-centered-cubic solid solution phase, (Ni, Co)Ti₂ inter metallic compound and TiN ceramic phase. With 1 T magnetic induction intensity assisted laser cladding, the microstructure of in-situ TiN displays a "cross" shape of the directional array. And the coating shows excellent wear resistance with an average microhardness of 760 HV. The worn surface morphologies of HEA coatings show that the wear mechanism is adhesive wear regardless of whether a magnetic field is added. This work can provide a novel and effective method to synthesize directional array microstructures to improve the performance of HEA coating, which will promote the further application of directional array microstructures in advanced manufacturing fields. [ABSTRACT FROM AUTHOR]