Synthesis, structure, and mechanical properties of Ni-Al and Ni-Cr-Al superalloy foams

Heeman Choe*, David C. Dunand

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

95 Scopus citations

Abstract

Reticulated nickel foams were alloyed with 8-9 wt% Al or 14-18 wt% Cr and 5-9 wt% Al in a three-step method consisting of (i) gas-phase deposition of Cr and/or Al onto the struts of a pure Ni foam by pack-cementation at 1000 °C; (ii) homogenization at 1200 °C to remove concentration gradients and to solutionize the alloyed struts; (iii) aging at 900 °C to form γ′ precipitates within the struts. The resulting alloyed foams retain the low relative densities (less than 3%) and open-cell structure with hollow struts of the original pure Ni foams, and they exhibit struts with the γ/γ′ structure typical of nickel-base superalloys. The compressive behavior of the superalloy foams, measured at ambient temperature, is compared to model predictions. The creep behavior of the superalloy foams, measured between 680 and 825 °C in the stress range of 0.1-0.3 MPa, is discussed using two models assuming strut compression or strut bending as deformation modes.

Original languageEnglish (US)
Pages (from-to)1283-1295
Number of pages13
JournalActa Materialia
Volume52
Issue number5
DOIs
StatePublished - Mar 8 2004

Keywords

  • Chemical vapor deposition
  • Creep
  • Foams
  • Nickel alloys
  • Precipitation strengthening

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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