Composite triply periodic minimal surface (TPMS) structures offer a promising approach to tailor material properties by combining the advantages of constituent materials. In this research, a novel composite SS316L-AlCoCrFeNi 2.1 functionally graded (FG) TPMS structure was developed by micro laser powder bed fusion (μLPBF). A dual structural design enables the integration of the inherent high strength of the low-relative-density AlCoCrFeNi 2.1 part with the high relative density-induced excellent load-bearing capacity of the SS316L section. During compression along the building direction, the deformation behavior of the composite FG structures was transformed from layer-by-layer to a coordinated deformation during the stress plateau stage, characterized by a relatively stable stress level as strain increases, undergoing strengthening, stress plateau, and strengthening stages at a high stress level. The participation of the AlCoCrFeNi 2.1 section also induces an enhanced mechanical response during the transversal compression. As a result, the developed structure processes enhanced mechanical properties, including plateau stress and energy absorption capacity, compared to the pure SS316L counterparts. The developed composite structure demonstrates a novel cost-effective strategy for achieving excellent mechanical response, showcasing significant potential for high-performance metamaterial applications.
Hu et al. (Fri,) studied this question.