Mechanical properties of directionally freeze-cast titanium foams

Jessica C. Li, David C. Dunand

Research output: Contribution to journalArticle

78 Scopus citations

Abstract

Titanium foams with aligned, elongated pores were created by directional freeze-casting of aqueous slurries of titanium powders, followed by ice sublimation and powder sintering. Increasing sintering times from 8 to 24 h and decreasing powder size from 20 to 10 μm resulted in improved densification within cell walls and decreased overall foam porosity, with a concomitant increase in compressive stiffness, yield strength and energy absorption. A simple model for foam stiffness and strength is in general agreement with experimental measurements of strength but overpredicts stiffness, probably because it does not take into account micro-plasticity occurring during measurements.

Original languageEnglish (US)
Pages (from-to)146-158
Number of pages13
JournalActa Materialia
Volume59
Issue number1
DOIs
StatePublished - Jan 1 2011

Keywords

  • Freeze-casting
  • Mechanical properties
  • Porous material
  • Powder processing
  • Titanium

ASJC Scopus subject areas

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

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