Fig. 1. Physical model of laser melting magnesium alloy

Fig. 2. Effect of different laser scanning speeds on the frontal appearance. (a) Frontal appearance; (b) results of frontal inspection

Fig. 3. Cross-sectional morphology of the molten pool. (a) v=40 mm/s; (b) v=50 mm/s; (c) v=60 mm/s

Fig. 4. Matrix structure. (a) Matrix under scanning electron microscope; (b) matrix under light microscope

Fig. 5. Surface structure of the melted zone. (a) v=40 mm/s; (b) v=50 mm/s; (c) v=60 mm/s

Fig. 6. Upper-middle area structure of the melted zone. (a) v=40 mm/s; (b) v=50 mm/s; (c) v=60 mm/s

Fig. 7. Structure at the junction of melted zone and matrix. (a) v=40 mm/s; (b) v=50 mm/s; (c) v=60 mm/s

Fig. 8. Molten pool by energy spectrum line scanning. (a) Schematic diagram of line scanning position; (b) change trend of element proportion

Fig. 9. Mesophase point scanning. (a) Bulky mesophase; (b) needle-like mesophase; (c) massive mesophase

Fig. 10. Effect of laser scanning speeds on hardness of melted layer. (a) v=40 mm/s; (b) v=50 mm/s; (c) v=60 mm/s

Fig. 11. Polarization curves at different scanning speeds