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A recent report on successful employment of the grain boundary strengtheningto design extraordinarily damage-tolerant architected materials (i.e.meta-crystals) necessitates fundamental studies to understand the underlyingmechanisms responsible for the toughening and high performance ofmeta-crystals. Such understanding will enable greater confidence and control indeveloping high performing and smart architected materials. In this study,buckling of lattice struts in single crystal-like meta-crystals was firstlyanalysed to reveal its role in shear band activities. Shear band systems ofsingly oriented meta-crystals were also identified to provide a solid basis forpredicting and controlling the shearing behaviour in polygrain-likemeta-crystals. The boundary-induced strengthening effects in meta-crystals wasfound to relate to the boundary type and coherency as they govern thetransmission of shear bands across meta-grain boundaries. The obtained insightsin this study provide crucial knowledge in developing high strength architectedmaterials with great capacity in controlling the mechanical strength and damagepath.

Revealing the origins of shear band activity and boundary strengthening in polygrain-like architected materials