Imperfections Formation in Thin Layers of NiTi Triply Periodic Minimal Surface Lattices Fabricated Using Laser Powder Bed Fusion

Shahadat Hussain, Ali N. Alagha, Wael Zaki

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In this paper, thin layers of NiTi shape memory alloy (SMA) triply periodic minimal surface lattices (TPMS) are fabricated using laser powder bed fusion (LPBF), considering different laser scanning strategies and relative densities. The obtained architected samples are studied using experimental methods to characterize their microstructural features, including the formation of cracks and balling imperfections. It is observed that balling is not only affected by the parameters of the fabrication process but also by structural characteristics, including the effective densities of the fabricated samples. In particular, it is reported here that higher densities of the TPMS geometries considered are generally associated with increased dimensions of balling imperfections. Moreover, scanning strategies at 45° angle with respect to the principal axes of the samples resulted in increased balling.

Original languageBritish English
Article number7950
JournalMaterials
Volume15
Issue number22
DOIs
StatePublished - Nov 2022

Keywords

  • additive manufacturing
  • architected materials
  • laser powder bed fusion
  • shape memory alloys
  • triply periodic minimal surfaces

Fingerprint

Dive into the research topics of 'Imperfections Formation in Thin Layers of NiTi Triply Periodic Minimal Surface Lattices Fabricated Using Laser Powder Bed Fusion'. Together they form a unique fingerprint.

Cite this