Fig. 1. Laser cladding powders. (a) FeCoNiCrMo powder; (b) LaB₆ powder

Fig. 2. Macroscopic morphology of LaB₆/FeCoNiCrMo cladding coatings

Fig. 3. XRD patterns of each cladding layer

Fig. 4. Morphology (left) and elements distribution (right) at the interface between C2 cladding layer and the substrate

Fig. 5. Microstructures of cladding layers. (a) C0 cladding layer; (b) C1 cladding layer; (c) C2 cladding layer; (d) C3 cladding layer; (e) C4 cladding layer; (f) microstructure of agglomeration area

Fig. 6. Typical phases in the cladding layers: σ-CrMo, La₂O₃, and TiB phases

Fig. 7. HRTEM images of TiB/La₂O₃ interface and the corresponding FFT (fast Fourier transform) patterns

Fig. 8. Mapping of LaB₆/FeCoNiCrMo high entropy alloy cladding layer

Fig. 9. Microhardness of each cladding layer and Ti6Al4V substrate

Fig. 10. Strengthening improvement value of LaB₆/FeCoNiCrMo cladding layers

Fig. 11. Friction coefficient of Ti6Al4V substrate and each cladding layer. (a) Real-time friction coefficient; (b) average friction coefficient

Fig. 12. Wear scar morphology of the substrate and each cladding layer. (a)(b) Ti6Al4V; (c)(d) C0 cladding layer; (e)(f) C1 cladding layer; (g)(h) C2 cladding layer; (i)(j) C3 cladding layer; (k)(l) C4 cladding layer

Fig. 13. Wear morphology of Ti6Al4V substrate. (a) Macroscopic wear profile; (b)(c) microscopic wear morphology and enlarged view of the marked area; (d) EDS analysis at the marked points A and B

Fig. 14. Wear morphology of cladding layers. (a) Wear morphology of C0 cladding layer; (b) wear morphology of C1 cladding layer; (c)(d) wear morphology of C2 cladding layer; (e)‒(g) wear morphology of C3 cladding layer; (h)(i) wear morphology of C4 cladding layer

Fig. 15. EDS map scanning analysis of C2 cladding layer wear surface

Fig. 16. Friction and wear mechanism of LaB₆/FeCoNiCrMo

Fig. 17. Corrosion resistance of Ti6Al4V substrate and each cladding layer. (a) Potentiodynamic polarization curve; (b) self-corrosion current density