## 3 Fabrication and Experiment Schedule  
Hybrid lattice sample fabrication and mechanical experiments are divided into two parts: the single unit cell lattice experiment (Figure 2a) and the multi-cell lattice experiment (Figure 2b). Two different types of hybrid structures consisting of ceramic and metal frame mass are shown in Figure 2a1, where the metal frames are conventional and re-entrant honeycomb shape, and the samples are made of a single unit cell, respectively. Afterwards, the quasi-static compression experiment (Figure 2a2) and the Hopkinson dynamic compression bar experiment (Figure 2a3) are performed, respectively, to study the mechanical properties of these two types of hybrid honeycomb lattices. Meanwhile, two different types of hybrid structures architected with multi-unit cells are designed and fabricated to understand the effects of layer numbers and unit cell numbers within each layer (Figure 2b1,b3), where the metal frames within the ceramic and metal frame hybrid structures are conventional and re-entrant unit cells, respectively. For these multi-unit cell lattice samples, only the Hopkinson compression bar experiment is performed (Figure 2b2). In the unit cell quasi-static compression test, the cell internal width and internal height of metal honeycomb frame structure is \(l=h=35\) mm, the thickness t = 5 mm and the depth of the structure is 10 mm. For the sample used in the Hopkinson experiment, the unit cell width and height of the metal honeycomb structure are \(l=h=5\) mm, the thickness t = 1.2 mm and the depth of the structure is 9 mm. As to the fabrication details of the 316L stainless steel external frame, powder of 316L stainless steel (Zhongmai Metal Co. Ltd., Nanjing, China), certified with the diameter of 45 \(\upmu\)m and the chemical composition of raw powder materials before the laser powder bed fusion process is shown in Table 1, where energy dispersive X-ray spectroscopy (EDS) in the SEM was used to characterize the chemical composition of the as-manufactured samples. We have chosen LPBF as the manufacturing method for exterior metal because LPBF is a timesaving, energy-saving, and clean manufacturing method. LPBF is a very mature way of manufacturing stainless steel 316. The 316L stainless steel external frames were fabricated on FS271M (Farsoon(r) Technology Co. Ltd., Shanghai, China), where the building direction of the re-entrant and ordinary honeycomb frames is along out-of-plane z direction, which is perpendicular to the x-y in-plane of 2D honeycomb. To obtain as-fabricated specimens with maximal density and minimal porosity, the process parameters were set as: laser beam power of 200 W, laser beam diameter of 0.1 mm, laser scanning speed of 2000 mm/s, layer thickness of 0.05 mm. In addition, the argon gas shielding technique is employed throughout the 3D printing process to avoid the risk of oxidation and contamination of alloy powder raw materials. The isotactic pressing sintering alumina ceramics were manufactured by ShenZhen Dachuan Ceramic Co. LTD,China. Afterwards, metal honeycomb frames and ceramic matrices are integrated through the snap-fit mechanical process for harvesting the final hybrid lattice (Figure 2a1,b1). In total, three specimens were tested for each experiment. As shown in Figure 2d, the samples are fabricated along the out-of-plane of the 2D honeycomb, built layer by layer with 316L powder with a bi-directional, double pass of laser beam, and 90\({}^{\circ}\) rotation scan vector between layers, thus the in-plane anisotropic mechanical properties can be minimized. As to the mechanical properties of constituent materials, 316L stainless steel is a good elastic-plastic material with a yield strength of 310 MPa, an ultimate strength of 690 MPa, and an elongation limit of 40%. The ceramic matrix exhibits linear brittle mechanical properties with a modulus of 350 GPa, and an ultimate strength of 3500 MPa.