Synergistic effects of crystalline microstructure, architected mesostructure, and processing defects on the mechanical behaviour of Ti6Al4V meta-crystals

Mechanical Characteristics of Architected Polycrystal Lattice Affected by the Orientation of Metagrain Boundary

“…Meanwhile, Figure 6c,d indicate that the EA and MCF of the architected polycrystal lattices of type I totally exceed those of A30, corroborating that the presence of the boundary contributes to the improvement of the energy absorption capacity compared with architected monocrystal lattices, which has been proved by previous works. [ 51,52,56 ] To be specific, the EA of G2B0 is 6.5% higher than that of A30, and the EA of G2B90 increases significantly by 21.7% compared with A30. Besides, the PCF decreases linearly with the increase of grain boundary angle, and MCF reaches the maximum when the grain boundary angle equals 26.55°.…”

“…First, some researchers adopted the grain boundary strengthening mechanisms in polycrystalline materials to improve architected lattices and demonstrated that the strength and stability of architected lattices can be dramatically increased as the significantly shortening and impeding effects of metagrain boundaries on the dominant shear bands. [ 50–52 ] Moreover, inspired by the precipitation hardening, Yin et al [ 53,54 ] developed dual‐phase mechanical metamaterial composites with improved strength and energy absorption capability. Xiao et al [ 55 ] successfully manufactured a dual‐phase microlattice, hybrid of OCT and BCC cells.…”

“…shortening and impeding effects of metagrain boundaries on the dominant shear bands. [50][51][52] Moreover, inspired by the precipitation hardening, Yin et al [53,54] developed dual-phase mechanical metamaterial composites with improved strength and energy absorption capability. Xiao et al [55] successfully manufactured a dual-phase microlattice, hybrid of OCT and BCC cells.…”

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

“…proposed that introducing grain boundaries and twin boundaries into the lattice will enhance the compressive strength and energy absorption of the architected lattice materials. The elaborately designed polycrystal lattice can effectively impede the shear bands from extending across the whole lattice specimen and thus prevent the catastrophic failure caused by the stress concentration. − Likewise, the strengthening mechanism induced by precipitation particles can also be mimicked to architect multiphase lattice materials with enhanced mechanical properties. In metallurgy, second-phase strengthening mechanisms such as precipitation strengthening are widely used to increase the material strength utilizing the impediment effect of the second-phase particles on the dislocation movements.…”

Thermally activated dependence of fatigue behaviour of CrMnFeCoNi high entropy alloy fabricated by laser powder-bed fusion

“…In comparison to conventional manufacturing, AM results in cellular (or dendritic) microstructures with dense dislocation tangles located at the cell boundaries due to inherently fast cooling rates of AM. Such microstructures were found to enhance the mechanical strength of alloys [9][10][11][12][13][14][15]. One of the main aims of ongoing research relating to AM fabrications is to produce structurally sound components of existing alloys while combining freedom of design and remarkable mechanical properties.…”