Superplastic foaming of titanium and Ti-6Al-4V

D. C. Dunand*, J. Teisen

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

21 Scopus citations

Abstract

Solid-state foaming of metals can be achieved by hot-isostatic pressing of powders in presence of argon followed by expansion of the resulting high-pressure argon bubbles at ambient pressure and elevated temperature. This foaming technique was first demonstrated by Kearns et al. [1] for Ti-6Al-4V, but is limited by its low creep rate and ductility, which lead to early cell wall fracture. We address these issues by performing the foaming step under superplastic conditions. Rather than using microstructural superplasticity (requiring fine grains which are difficult to achieve in porous powder-metallurgy materials), we used transformation superplasticity, which occurs at all grain sizes by biasing with a deviatoric stress (from the pore pressure) of internal stresses (from the allotropic mismatch during thermal cycling about the allotropic temperature range). As compared to control experiments performed under isothermal creep conditions, superplastic foaming under temperature cycling of unalloyed titanium and alloyed Ti-6Al-4V led to a significantly higher pore volume fraction and higher foaming rate.

Original languageEnglish (US)
Pages (from-to)231-236
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume521
DOIs
StatePublished - 1998
EventProceedings of the 1998 MRS Spring Symposium - San Francisco, CA, USA
Duration: Apr 14 1998Apr 16 1998

ASJC Scopus subject areas

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

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