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Beam nanolattice is a new class of mechanical metamaterials with characteristic sizes on the order of hundreds of nanometers. Due to extremely special size effects, structural characteristics and material selection, the mechanical properties of this type of porous materials can simultaneously achieve high strength and high strain with lighter weight, which is expected to bring revolutionary applications in the field of high-performance functional materials in the future. However, the traditional photochemical preparation technology is limited by the optical diffraction limit, it is challenging to make breakthrough in the precise fabrication of metallic beam nanolattice with beam diameter of less than 100 nm, and thus their mechanical properties remain ambiguous.
In this work, a new type of quasi-body centered cubic (quasi-BCC/BCCZ) beam nanolattice mechanical metamaterial is proposed, which is experimentally implemented with ion track technology based on the Heavy Ion Research Facility in Lanzhou (HIRFL). The beam diameter can be as small as 34 nm, breaking through the size limit of the beam nanolattices mechanical metamaterials. In situ compression experiment results show that the energy absorption capacity of the quasi-BCC/BCCZ beam nanolattice exceeds that of the previously reported beam nanolattices. This work deepens the understanding of the mechanical properties of beam nanolattices. At the same time, the application of ion track technology in the study of nanostructured materials is realized, which provides a new idea for the exploration of beam nanolattice with ultra-high energy absorption capacity.