About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing of Functional and Energy Materials
|
Presentation Title |
Polycrystal-inspired Hierarchical Lattice Materials |
Author(s) |
Jedsada Lertthanasarn, Chen Liu, Everth Hernández-Nava, Iain Todd, Minh-Son Pham |
On-Site Speaker (Planned) |
Jedsada Lertthanasarn |
Abstract Scope |
Lattice materials contain complex porous structures that offer an outstanding strength to weight ratio, but often suffer from post-yield instability. We propose a novel approach to lattice design to overcome this limitation based on mimicking crystal microstructure. Here, boundary hardening was employed to control the propagation of deformation bands in lattice materials. Such boundaries were introduced via tailoring the misorientations between adjacent lattice domains, resulting in a marked increase in strength and toughness. Moreover, fabricating such polycrystal-inspired lattices with Ti-6Al-4V leads to metamaterials that consist of a hierarchical lattice structure. Such metamaterials, termed meta-crystals, feature a BCC/HCP dual-phase microstructure characteristic of Ti-6Al-4V at the micro-scale, coupled with the FCC polygrain-like structure of the architected lattices at the meso-scale. With AM’s unique ability to control the micro- and meso-structure, we can optimise meta-crystals through different combinations of polycrystal microstructure and meso-lattice architecture to achieve the desired mechanical properties. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |