Fig. 1. Morphologies and particle size distribution of powders. (a) 7075 aluminum alloy powder; (b) ZrCuAlNi amorphous alloy powder; (c) composite powder; (d) particle size distribution of composite powder

Fig. 2. Surface morphologies of single-track under different process parameters

Fig. 3. Cross-section morphologies of single-track molten pool under different laser scanning speeds (380 W)

Fig. 4. Schematic of track overlap and statistical diagram of track overlap rate under different process parameters (P＝380 W).(a) Schematic of track overlap; (b) statistical diagram of track overlap rate

Fig. 5. Three-dimensional surface morphologies under different process parameters

Fig. 6. Stitched image of cubic specimens printed under different orthogonal experiment parameters

Fig. 7. Metallographic diagrams of cubic samples. (a) Sample S1; (b) sample S4; (c) sample S6; (d) sample S13

Fig. 8. Influences of laser power and scanning speed on relative density. (a) Influence of laser power on relative density; (b) influence of laser scanning speed on relative density

Fig. 9. SEM images of cubic samples. (a) Sample S4; (b) sample S6

Fig. 10. Structure diagrams of columnar and equiaxed grains. (a) Columnar grains; (b) equiaxed grains

Fig. 11. Electron back-scatter diffraction (EBSD) analysis. (a) Grain orientation map of sample S6; (b) pole figures of sample S6; (c) EBSD characterization of 7075 aluminum alloy LPBF forming sample^[14]; (d) EBSD characterization of 2024 aluminum alloy single-layer three-track LPBF forming sample^[18]

Fig. 12. Influence of laser energy density on microhardness of cubic samples

Fig. 13. Microhardness of 7075 aluminum alloys fabricated by LPBF (HIP: hot isostatic pressing)