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首页> 外文期刊>Materials Science and Engineering >Ti-6Al-4V ELI microlattice structures manufactured by electron beam melting: Effect of unit cell dimensions and morphology on mechanical behaviour
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Ti-6Al-4V ELI microlattice structures manufactured by electron beam melting: Effect of unit cell dimensions and morphology on mechanical behaviour

机译：通过电子束熔化制造的TI-6AL-4V ELI Microlate结构：单位细胞尺寸和形态对机械行为的影响

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摘要

Additive manufactured titanium alloy microlattice structures are attracting the attention of numerous industrial fields, since they allow a customised and optimised design of components and structures.In the current work, Electron Beam Melting (EBM) technique was used to produce Ti6Al4V ELI rhombic dodecahedron (RD) microlattice structures. Preliminary tests on bulk specimens highlighted the effect of surface roughness on mechanical response. A confocal microscope was used to characterise surface topography and to obtain a precise evaluation of surface roughness, which is a critical point in EBM technique.Three different unit cell sizes were selected in order to investigate the effect of cell dimensions on microlattice mechanical properties. Morphological evaluations were performed through Computed Tomography (CT) technique, which allowed the comparison of the real models to the designed one. Discrepancies between actual and CAD geometries were observed, with increasing importance for lower cell sizes.Quasi-static compression tests and low velocity impact tests were performed on RD lattices, highlighting a decrease in mechanical properties with the increase of cell size, except for the specific energy absorption, which depends also on lattice density.A heat treatment was performed on lattice structures, but its effect on mechanical properties was negligible, mainly for the higher cell size lattice, proving the lack of significant residual stresses in lattices produced via EBM.Thermographic observations during compression tests allowed a clear identification of the failure instant and the deformation mode, which occurs along a 45(center dot) inclined plane.
机译：添加剂制造的钛合金Microlatture结构是吸引了众多工业领域的注意，因为它们允许定制和优化的部件和结构设计。当前工作中，电子束熔化（EBM）技术用于生产Ti6Al4V Eli菱形十二锭（RD ）微池结构。散装样品上的初步试验强调了表面粗糙度对机械反应的影响。共聚焦显微镜用于表征表面形貌并获得精确评估表面粗糙度，这是EBM技术中的临界点。选择了三种不同的单位细胞尺寸以研究细胞尺寸对微胶质机械性能的影响。通过计算机断层扫描（CT）技术进行了形态学评估，该技术允许将真实模型与设计的技术进行比较。观察到实际和CAD几何形状之间的差异，随着较低电池尺寸的重要性。Quasi-静态压缩试验和低速冲击试验在RD格子上进行，突出显示电池尺寸的力学性能的降低，除了具体也取决于晶格密度的能量吸收。对晶格结构进行热处理，但其对机械性能的影响忽略不计，主要针对较高的细胞尺寸格子，证明通过EBM.Thermach制作的晶格中的缺乏显着的残余应力压缩测试期间的观察允许沿45（中心点）倾斜平面发生故障瞬间和变形模式的清晰识别。

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