标题： 通过微结构优化稳定拉伸主导的格子结构的屈服后行为 显示英文标题

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

摘要： 我们研究了微结构对由缺陷容限型Ti-14 Mo二元合金通过电子粉末床融合制造的晶格结构力学响应的影响。 一些晶格结构经历了不同的热处理以比较不同的微结构：一种从制造（原装）继承的两相$\alpha$+$\beta$微结构，一种完全的$\beta$-亚稳态微结构，以及一种通过$\omega$同素相纳米析出增强的$\beta$-亚稳态微结构。 我们证明了最流行的拉伸主导晶格结构之一，即八面体桁架，其宏观力学行为可以通过增加组成杆件对塑性屈曲的耐受性来通过微结构优化进行调整。 具有缺陷容限的材料为通过增材制造制造具有优化能量吸收性能的晶格结构铺平了道路。 显示英文摘要

摘要： 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 $\alpha$+$\beta$ microstructure inherited from the fabrication (as-built), a full $\beta$-metastable microstructure, and a $\beta$-metastable microstructure strengthened via nanoprecipitation of the $\omega$iso 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.