Fig. 1. XRD patterns of Mg-Zn-Y-Zr alloy solidified under different laser powers

Fig. 2. (a) EDS analysis positions of substrate organization; (b)-(d) analysis results of micro segregation in different positions

Fig. 3. Microstructure and area classification of longitudinal section under different laser powers. (a) 800 W; (b) 1000 W; (c) 1200 W; (d) 2000 W

Fig. 4. Optical micrograph of FGR. (a) 800 W; (b) 1000 W; (c) 1200 W; (d) 2000 W

Fig. 5. Microstructure in FGR and EDS analysis positions of substrate organization under different laser powers. (a) 800 W; (b) 1000 W; (c) 1200 W; (d) 2000 W

Fig. 6. Heat affected zone and fine grain zone hardness distribution characteristics. (a) 800 W; (b) 1000 W; (c) 1200 W; (d) 2000 W

Fig. 7. Vickers hardness-crystal zone curve. (a) 800 W; (b) 1000 W; (c) 1200 W; (d) 2000 W

Fig. 8. Curves of Vickers hardness and laser power

Fig. 9. Curve of friction coefficients and time. (a) 800 W; (b) 1000 W; (c) 1200 W; (d) 2000 W

Fig. 10. Comparison chart of weight loss

Fig. 11. SEM morphology of worn surface on remelting layer. (a) 800 W; (b) 1000 W; (c) 1200 W; (d) 2000 W