Anisotropic mechanical properties of amorphous Zr-based foams with aligned, elongated pores

Marie E. Cox*, David C Dunand

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Equal-channel angular extrusion is used to consolidate a blend of amorphous Zr56.3Nb5.1Cu15.6Ni12.9Al 10.0 and crystalline W powders into dense composites. Chemical dissolution of the crystalline phase results in amorphous foams with elongated pores, aligned at a 22-28 angle with respect to the extrusion direction, whose compressive properties are studied for various orientations. As the angle between the pore long direction and the applied stress direction increases from 0 to 68, there is a significant decrease in loading stiffness and peak stress, as expected from predictive analytical models; however, the observed increase in stiffness and peak stress observed when the pores are oriented 90 to the direction of loading is not predicted by all of the models. Foams with pores aligned 24-68 to the direction of loading show increased plastic bending in individual walls and accumulation in microscopic damage without failure, leading to increased compressive ductility and absorbed energy over other orientations.

Original languageEnglish (US)
Pages (from-to)5937-5948
Number of pages12
JournalActa Materialia
Volume61
Issue number16
DOIs
StatePublished - Sep 1 2013

Keywords

  • Bulk metallic glass
  • Equal channel angular press
  • Metallic foam
  • Porous material
  • Zirconium-based glassy alloy

ASJC Scopus subject areas

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

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