Fig. 1. Schematic of laser additive manufacturing system[17]

Fig. 2. Research process map of effects of laser power and scanning speed on Mg-9%Al alloy[22]

Fig. 3. Surface morphologies of AZ91D alloys with different laser energy densities[20]

Fig. 4. XRD patterns of Mg-Ca alloy[23]. (a) XRD patterns of Mg-Ca alloy obtained at different energy densities; (b) details about regions marked as A;(c) details about regions marked as B

Fig. 5. Microstructures of AZ91D magnesium alloy[20]. (a) Laser additive manufacturing; (b) casting

Fig. 6. Microstructure and metallographic microscopes of magnesium alloy fabricated by laser additive manufacturing technique. (a) Metallographic microscope of longitudinal section of AZ91D alloy[20]; (b) metallographic microscope of cross section of Mg-Ga alloy [23]; (c) metallographic microscope of cross section of AZ91D alloy[20]; (d) microstructure of cross section of AZ91D alloy[20]

Fig. 7. Microstructures of Mg-Zn-Zr alloys fabricated by laser additive manufacturing technique[36]. (a)(b) Mass fraction of Zn is 5.2%; (c)(d) mass fraction of Zn is 30%

Fig. 8. Relationship between microhardness and grain size for magnesium alloy fabricated by laser additive manufacturing technique[49]

Fig. 9. Comparison of microhardness and Young's modulus of magnesium alloys fabricated by laser additive manufacturing technique and conventional casting and forging[40]

Table 1. Laser energy density and relative density of magnesium alloy fabricated by laser additive manufacturing technique