Superelasticity in β titanium alloys with nitrogen addition

T. Furuhara, S. Annaka, T. Maki

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Deformation behavior at room temperature was examined in near-β titanium alloys, Ti-10V-2Fe-3Al, containing small amounts of N up to 0.2 mass%. After a β solution treatment, thermally induced α″ martensite is formed in the N-free alloy but no martensite is formed in the 0.1 and 0.2% N alloys. In the N-free alloy, stress-induced α″ martensite transformation occurs during deformation at room temperature, and a shape memory effect by heating after deformation is exhibited, as was previously reported. In the N-containing alloys, shape recovery over 90%, which is much larger than that in the N-free alloy, was obtained by unloading after a bending deformation. In the 0.1 % N alloy, forward and reverse martensite transformations are observed during tensile deformation by in-situ optical microscopy, confirming the occurrence of superelasticity in this alloy. On the other hand, a large elastic strain over 1 % is obtained in the 0.2% alloy by strengthening of β matrix, although the α″ martensite introduced by further deformation does not disappear by unloading.

Original languageEnglish
Pages (from-to)761-764
Number of pages4
JournalJournal of Materials Engineering and Performance
Issue number6
Publication statusPublished - 2005 Dec


  • β titanium alloy
  • Martensite
  • Nitrogen
  • Phase transformation
  • Superelasticity


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