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Article Dans Une Revue Scripta Materialia Année : 2022

Stabilizing post-yielding behavior of a stretching dominated lattice structure through microstructural optimization

Résumé

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.
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hal-03863809 , version 1 (25-11-2022)

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Mathis Duport, Guilhem Martin, Pierre Lhuissier, Jean-Jacques Blandin, Frédéric Prima, et al.. Stabilizing post-yielding behavior of a stretching dominated lattice structure through microstructural optimization. Scripta Materialia, 2022, 219, pp.114887. ⟨10.1016/j.scriptamat.2022.114887⟩. ⟨hal-03863809⟩
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