Abstract
The microstructure, microhardness, and the tribological behavior of Zr, Nb and Mo-doped Fe2Ni2CrV0.5 high-entropy alloy (HEA) coatings prepared by laser cladding were investigated and compared in parallel. The Nb-doped coating with 86 % volume fraction Fe2Nb Laves phase containing only three slip systems exhibits superior tribological properties than Zr-doped coating which has 78 % proportion of FCC phase. The Nb-doped coating with microhardness of 745 HV is invulnerable to wear loss due to triple constraint effect of dislocation movement, while the Zr-doped coating is susceptible to severe delamination wear owing to the lower microhardness (287 HV) compared to the GCr15 counterpart (650 HV). The Mo-doped coating with the microhardness of 585 HV presents the best wear resistance, which is attributed to the strength-toughness synergistic effect caused by σ phase and alternating arrangement eutectic nanoscale lamellar structure (FCC/σ). Relatively large microhardness difference leads to the abrasive chips adhesion phenomenon between the coatings and the GCr15 counterpart, except for the friction pair of Mo-doped coating/GCr15.
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