Abstract
The objective of the study is to investigate the strengthening mechanism of embedded meta-precipitates in the design of architected metamaterials. Four precipitate-type architected metamaterials are designed and prepared by fused deposition modelling (FDM). The difference of mechanical properties and deformation mode of these structures is analyzed. The strengthening effect of the introduced meta-precipitates is then compared with Orowan bypass strengthening mechanism. The similarities and discrepancies of metallurgical hardening principles and that found in architected metamaterials are established. It is found that due to the introduction of embedded meta-precipitates, the deformation of the structure changes significantly from diagonal crushing to a meander route, thus improves the mechanical properties and energy absorption abilities. The hindering effect and the influence of volume fraction of meta-precipitates is similar to Orowan bypass mechanism.
Highlights
Architected metamaterials represent a class of artificially-designed materials that consist of periodically arranged microstructures [1]
Structure is loaded beyond the elastic limit. This sort of shear band has been observed in samples micro‐lattice but with vertical pillars), in which the deformation localization was found to be with a variety of lattice structures such as BCC, BCC-Z and face-centered cubic structure (FCC)-Z
The phenomenon is similar to the slip band along but with vertical pillars), in which the deformation localization was found to be accorded with internal particular direction as shown in Figure 8, when single crystals are loaded beyond the yield point and node movement [44]
Summary
Architected metamaterials represent a class of artificially-designed materials that consist of periodically arranged microstructures [1]. Desirable properties can be implemented in architected metamaterials that previously unachievable in conventional solids [2], such as ultra-lightweight [1,3], excellent energy absorption [4], negative Poisson’s ratio [5] and heat dissipation [6]. This novel group of materials has been receiving considerable attention as structural materials for a myriad of applications in the industry of aerospace [7] and medicine [8]. To meet the demand of various applications, a great deal of unit cell structures has been designed and investigated
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