Transformation-mismatch superplasticity in pure titanium and a titanium matrix composite

Cynthia M. Bedell*, Peter Zwigl, David C. Dunand

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Commercially-pure titanium containing 0 vol.% and 10 vol.% TiC particulates was thermally cycled about the allotropic transformation temperature of the matrix while being subjected to an external uniaxial tensile stress. Under these conditions, unreinforced titanium is superplastic, as evidenced by a high strain to fracture of 200% and a high strain-sensitivity exponent. The average strain per cycle is in good agreement with existing transformation-mismatch superplasticity models, based on the biasing by the external stress of the transformation mismatch stresses or strains. Transformation-mismatch superplasticity is also observed in the Ti-10% TiC metal matrix composite, which displays a strain to fracture of 135% and an average strain per cycle significantly higher than for unreinforced titanium. This novel effect is modeled by considering the increase in mismatch stresses in the composite, as a result of the inert TiC particles in the transforming titanium matrix.

Original languageEnglish (US)
Title of host publicationSuperplasticity and Superplastic Forming
PublisherMinerals, Metals & Materials Soc (TMS)
Pages125-133
Number of pages9
StatePublished - Dec 1 1995
EventProceedings of the 1995 124th TMS Annual Meeting - Las Vegas, NV, USA
Duration: Feb 13 1995Feb 16 1995

Other

OtherProceedings of the 1995 124th TMS Annual Meeting
CityLas Vegas, NV, USA
Period2/13/952/16/95

ASJC Scopus subject areas

  • Geology
  • Metals and Alloys

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