Enhancing specific energy absorption of additively manufactured titanium lattice structures through simultaneous manipulation of architecture and constituent material

Titanium lattice structures have found a wide range of lightweight applications. However, made from the commonly-used commercially pure titanium (CP−Ti) and Ti−6Al−4V exhibit either low strength or post-yielding softening/collapse under uniaxial compression, making them less attractive to energy absorbing In present work, series gyroid been designed additively manufactured by laser powder bed fusion (L-PBF) enhance specific absorption (SEA) through manipulation architecture constituent material. Experimental results show that tailoring sheet thickness gradient enables transformation macroscopic deformation mode hardening followed softening, which is commonly seen in structures, continuous hardening. The addition MgO nanoparticles CP−Ti feedstock further improves yield oxygen solute strengthening, while maintaining behaviour without any softening collapse. As result, when both are introduced, SEA uniform structure enhanced approximately 63% due combination high strength. Finite element analysis based on modified volumetric model has performed shed light underlying mechanism governs behaviour. This study demonstrates tremendous potential marrying engineering with material design create performance L-PBF.