Mechanics of superelasticity in Ti-30Nb-(8-10)Ta-5Zr alloy

E. G. Obbard, Y. L. Hao, T. Akahori, R. J. Talling, M. Niinomi, D. Dye, R. Yang

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


The superelastic behaviour of Ti-30Nb-10Ta-5Zr and Ti-30Nb-8Ta-5Zr (wt.%) biomedical alloys was investigated by tensile testing and in situ synchrotron X-ray diffraction. The phenomenological theory of martensite crystallography and texture prediction based on the Schmid law indicate that α in Ti-30Nb-10Ta-5Zr forms in untwinned variants. Measurement of single-crystal elastic constants using an Eshelby-Kroener-Kneer self-consistent model shows that the 10-Ta alloy has a C modulus 3 GPa higher than that of the 8-Ta alloy. That it nevertheless has a proof stress 35 MPa lower can be qualitatively explained by the differences in martensite crystallography. The results suggest that high tensile strength can be maintained for low modulus β -Ti in spite of martensitic transformation by optimizing transformation strains.

Original languageEnglish
Pages (from-to)3557-3567
Number of pages11
JournalActa Materialia
Issue number10
Publication statusPublished - 2010 Jun


  • Martensitic phase transformation
  • Shape memory alloys
  • Synchrotron radiation
  • Titanium alloys
  • X-ray diffraction

ASJC Scopus subject areas

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


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