41368 2017 eng Article 300, 1 12 8 7 article MDPI 1 -- -- -- Metallic lattice structures intentionally contain open porosity; however, they can also contain unwanted closed porosity within the structural members. The entrained porosity and defects within three different geometries of Ti-6Al-4V lattices, fabricated by Selective Electron Beam Melting (SEBM), is assessed from X-ray computed tomography (CT) scans. The results suggest that horizontal struts that are built upon loose powder show particularly high (~20 x 10⁻³ vol %) levels of pores, as do nodes at which many (in our case 24) struts meet. On the other hand, for struts more closely aligned (0° to 54°) to the build direction, the fraction of porosity appears to be much lower (~0.17 x 10⁻³%) arising mainly from pores contained within the original atomised powder particles. Metals 10.3390/met7080300 http://www.mdpi.com/2075-4701/7/8/300 urn:nbn:de:kobv:b43-413689 2075-4701 21.09.2017 Creative Commons - Namensnennung 3.0 E. Hernández-Nava S. Tammas-Williams C. Smith Fabien Léonard P. J. Withers I. Todd R. Goodall eng uncontrolled Cellular solids eng uncontrolled Aqdditive manufacturing eng uncontrolled Computed tomography eng uncontrolled Titanium alloys Ingenieurwissenschaften und zugeordnete Tätigkeiten Verlagsliteratur Datei für die Öffentlichkeit verfügbar ("Open Access") Wissenschaftliche Artikel der BAM Bundesanstalt für Materialforschung und -prüfung (BAM) https://opus4.kobv.de/opus4-bam/files/41368/metals-07-00300.pdf