A Novel Precipitate-Type Architected Metamaterial Strengthened via Orowan Bypass-Like Mechanism

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.

Mechanical Properties of Internally Hierarchical Multiphase Lattices Inspired by Precipitation Strengthening Mechanisms

“…Regarding the mechanisms underlying the enhanced mechanical properties of the multiphase lattices, a previous study borrowed the Orowan looping mechanism of precipitate strengthening to explain the strengthened mechanical behaviors in macro bi-phase lattices. 70 The hard phase of stiffer cells can obstruct the extension of shear bands and make the shear bands deflect around the hard phase, reminiscent of the bypass of dislocations around the hard precipitates in the Orowan mechanism. The bypass-like behavior is due to the absolute difference in the stiffness of the matrix phase and the second phase.…”

A Recent Review of the Sandwich-Structured Composite Metamaterials: Static and Dynamic Analysis

“…The potential of metamaterials to cloak and manipulate light has made them a breakthrough technology [11,12]. A metamaterial is an artificial material exhibiting properties different from natural ones [13]. Due to their outstanding mechanical and physical properties, metamaterials have attracted much attention in recent decades.…”