High-temperature mechanical properties of γ/γ′ Co–Ni–W–Al superalloy microlattices

Hyeji Park, Chunan Li, Adam E. Jakus, Ramille N. Shah, Heeman Choe, David C. Dunand*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Cobalt-based superalloy microlattices were created via (i) three-dimensional-extrusion printing of inks containing a suspension of Co-, Ni- and W-oxide particles, (ii) H2-reduction of the oxides and sintering to a homogenous Co-Ni-W alloy, (iii) Al pack-cementation to deposit Al on the microlattice struts, followed by Al-homogenization. The resulting Co-(18–20)Ni-(5–6)W-(10–13)Al (at.%) microlattices, with 27–30% relative density and 350 μm diameter struts, display a peak in yield strength at 750 °C, consistent with their γ/γ′ aged microstructure. Oxidation resistance is strongly improved compared to Al-free printed Co-Ni-W lattices, via the formation of an Al2O3 surface layer. However, the resulting Al depletion within the struts reduces creep resistance at 850 °C, which nevertheless remains similar to Ni-based superalloy foam, with 35% relative density.

Original languageEnglish (US)
Pages (from-to)146-150
Number of pages5
JournalScripta Materialia
Volume188
DOIs
StatePublished - Nov 2020

Keywords

  • 3D-printing
  • Co-based superalloy
  • High-temperature characterization
  • Mechanical property
  • Microlattice architecture

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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