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Architected materials produced by powder bed fusion metal additivemanufacturing technique offer realization of complex structural hierarchiesthat mimic the principles of crystal plasticity while still beingultralight-weight, though suffering from deep-rooted multiscale defectsincluding microstructural heterogeneity caused by the complex thermo-mechanicaltransients in the melt pool. Here we manufacture meta-crystal 316L stainlesssteel microlattice structures by selective laser melting process for utilizingthe strain localization mechanism in bulk structures akin to dislocation slipmediated plasticity. The build angle was observed to be the primary influencerof defects generated and the presence of inherent voids was the major drawbackthat would undermine their structural performance as mechanical metamaterials.However, other defects in the form of spatially correlated dislocation networksand micro-segregated cellular substructures overcome the strength-ductilitytrade-off and render the bulk structures comparable to other engineeringmaterials including conventional steels. By exploiting this intrinsicstrengthening mechanism, the bond strength of meta-crystals (i.e. strutstrength) can be enhanced (or controlled) on top of employing hardeningprinciples of metallurgy to design materials with desired properties.

Enhancing the bond strength in meta-crystal lattice of architected materials