Kinetics of biaxial dome formation by transformation superplasticity of titanium alloys and composites

Megan Frary, Christopher Schuh, David C. Dunand

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


By thermally cycling through their transformation temperature range, coarse-graned polymorphic materials can be deformed superplastically, owing to the emergence of transformation mismatch plasticity (or transformation superplasticity) as a deformation mechanism. This mechanism is presently investigated under biaxial stress conditions during thermal cycling of unalloyed titanium, Ti-6Al-4V, and their composites (Ti/10 vol. pct TiCp, Ti-6Al-4V/10 vol. pct TiCp, and Ti-6Al-4V/5 vol. pct TiBw). During gas-pressure dome bulging experiments, the dome height was measured as a function of forming time. Adapting existing models of biaxial doming to the case of transformation superplasticity where the strain-rate sensitivity is unity, we verify the operation of this deformation mechanism in all experimental materials and compare the biaxial results directly to new uniaxial thermal cycling results on the same materials. Finally, existing thickness distribution models are compared with experimentally measured profiles.

Original languageEnglish (US)
Article number176
Pages (from-to)1669-1680
Number of pages12
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number6
StatePublished - Jan 1 2002

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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