We investigate the effect of the microstructure on the mechanical response of lattice structures made of a defect tolerant Ti-14 Mo binary alloy fabricated by Electron Powder Bed Fusion. Some of the lattice structures were subjected to different heat treatments to compare different microstructures: a two-phase α+β microstructure inherited from the fabrication (as-built), a full β-metastable microstructure, and a β-metastable microstructure strengthened via nanoprecipitation of the ωiso phase. We demonstrate that the macroscopic mechanical behavior of one of the most popular stretching-dominated lattice structure, namely the octet-truss, can be tailored through microstructural optimization by increasing the tolerance to plastic buckling of the constitutive struts. Defect-tolerant materials pave the way towards lattice structures fabricated by additive manufacturing with optimized energy absorption performances.
@article{arxiv.2501.14307,
title = {Stabilizing post-yielding behavior of a stretching dominated lattice structure through microstructural optimization},
author = {Mathis Duport and Guilhem Martin and Pierre Lhuissier and Jean-Jacques Blandin and Frédéric Prima and Rémy Dendievel},
journal= {arXiv preprint arXiv:2501.14307},
year = {2025}
}