Structure and mechanical properties of Ti-6Al-4V with a replicated network of elongated pores

Daniel J. Jorgensen, David C Dunand

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Ti-6Al-4V, with a network of elongated, open pores aligned along two perpendicular directions, is produced by a two-step replication process: (i) Ti-6Al-4V powder or foil preforms containing low-carbon steel wire meshes are densified by hot pressing under transformation superplasticity conditions; (ii) porosity is created by electrochemical dissolution of the low-carbon steel wires and the adjacent Fe-containing Ti-6Al-4V matrix. If high-carbon steel wires are used, Fe diffusion into Ti-6Al-4V is inhibited by a carbide layer forming at the wire/matrix interface, and pores exactly replicate the shape of the wires. Ti-6Al-4V with ∼19% and 34% porosity, without and with Fe-Ti interdiffusion respectively, shows low oxygen contamination and good compressive ductility. Strength and stiffness, as measured by compression testing and ultrasonic measurements, are compared with simple analytical models and numerical finite-element models.

Original languageEnglish (US)
Pages (from-to)640-650
Number of pages11
JournalActa Materialia
Volume59
Issue number2
DOIs
StatePublished - Jan 1 2011

Keywords

  • Porous material
  • Powder processing
  • Space-holder electro-dissolution
  • Superplasticity
  • Titanium alloys

ASJC Scopus subject areas

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

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