[SIS2] Novel processing strategies for Beam Based AM

[14B-SIS2-03] Ti-6Al-4V Hollow-strut, Hybrid-strut, and Multi-topology Metal Lattice Metamaterials

J. Noronha¹, J. Dash¹, M. Leary¹, M. Brandt¹, *M. Qian¹ (1.RMIT University, Australia)

Keywords:Additive manufacturing, lattice metamaterials, solid-strut lattice, hollow-strut lattice, multi-topology lattice

The growing demand for lightweight, high-performance engineering materials continues to drive material innovation. Mechanical metamaterials are cellular materials. Titanium alloy (Ti-6Al-4V) solid-strut lattices are the most common form of metal mechanical metamaterials, however, the requirement for even stress distribution and better load-bearing properties has inspired the design of lattices with hollow struts, hybrid (hollow and solid) struts, and multi-topologies (hollow-strut lattices combined with thin-plate lattices). Based on detailed experimental studies, this paper compares the structural efficiency and deformation behaviour for Ti-6Al-4V solid-strut, hollow-strut, hybrid-strut, and multi-topology metal lattice metamaterials manufactured by laser powder bed fusion (LPBF). The results show that at the same density, multi-topology metal lattice metamaterials exhibit the highest structural efficiency in terms of yield strength, followed by hollow-strut, and then solid-strut metal lattice metamaterials. New design strategies are proposed for improving the structural efficiency of each type of lattice metamaterial.