Fig. 1. Lattice structures. (a)(b) Models; (c) final samples

Fig. 2. Invar alloy. (a) Powder morphology; (b) size distribution

Fig. 3. Finite element model and stress-strain curve. (a) Finite element analysis model of lattice-filled structure compression; (b) true stress-strain curve of invar alloy

Fig. 4. Micrographs of lattice-filled structure. (a) SEM image of skin section; (b)(c) SEM images of lattice structure strut surface; (d) optical microscope image of strut section

Fig. 5. Compression stress-strain curves of lattice-filled structures. (a) L=8 mm; (b) L=6 mm; (c) L=4 mm

Fig. 6. Properties of lattice-filled structures. (a) Plateau stress; (b) specific plateau stress; (c) elastic modulus; (d) specific elastic modulus; (e) energy absorption; (f) specific energy absorption

Fig. 7. Compression processes of lattice-filled structures with different structural parameters. (a) L=8 mm; (b) L=6 mm; (c) L=4 mm

Fig. 8. Stress distributions of lattice-filled structures under different compressive strains. (a) L8-d0.8; (b) L6-d1.0; (c) L4-d1.2

Fig. 9. SEM images of fracture morphology

Fig. 10. Different deformation behaviors of struts. (a) L8-d0.8; (b) L4-d1.2

Fig. 11. Variation of structure parameters with relative density. (a) Elastic modulus; (b) plateau stress