|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Beyond the Beam III
||Topological toughness in additively manufactured ceramic architected materials
||Raphael Thiraux, Alexander Dupuy, Lorenzo Valdevit
|On-Site Speaker (Planned)
Technical ceramics exhibit exceptional high-temperature mechanical properties, but unfortunately their brittleness and high melting points make it challenging to manufacture geometrically complex structures with sufficient toughness. Additive manufacturing technologies enable the fabrication of large-scale complex-shape artifacts with architected internal topology; when such topology can be arranged at the microscale, this presents an opportunity to control the form and population of defects, thus affecting its strength. Here, we fabricate ceramic micro-architected materials using direct ink writing (DIW) of an alumina nanoparticle-loaded ink, we investigate the microstructure of the sintered structures, to assess their composition, density, grain size and defect population. Finally, we explore the compressive strength of fully dense and cellular ceramics. We find that woodpile architected materials with relative densities in the 0.4 to 0.7 range exhibit higher strength and damage tolerance than fully dense ceramics printed under identical conditions, an intriguing feature that we attribute to topological toughening.
||Additive Manufacturing, Mechanical Properties, Ceramics