Effect of prestrain on martensitic transformation in a Ti 46.4Ni47.6Nb6.0 superelastic alloy and its application to medical stents

T. Takagi, Y. Sutou, R. Kainuma, K. Yamauchi, K. Ishida

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The effect of applied strain on martensitic transformation in a superelastic Ti46.4Ni47.6Nb6.0 alloy at room temperature was investigated by tensile tests, differential scanning calorimetry measurements, and X-ray diffraction. Reverse transformation starting (A s) and finishing (Af) temperatures increased with the application of tensile-strain over 13%, the undeformed specimen showing A s = -29.2°C and Af = 17.9°C, while the 13% predeformed alloy exhibited As = 37.1°C and Af = 40.2°C. Furthermore, the values of the As and Af for the predeformed alloy almost recovered to those of the undeformed alloy when heated to about 42°C and then showed superelasticity again at room temperature. This characteristic is significant for application in sensors, actuators, and medical devices. Especially, medical stents with such qualities show promise as a new class of self-expandable stents with both excellent mountability and deliverability.

Original languageEnglish
Pages (from-to)179-183
Number of pages5
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Volume76
Issue number1
DOIs
Publication statusPublished - 2006 Jan

Keywords

  • Martensitic transformation
  • Shape memory alloy
  • Stent
  • Superelasticity
  • Ti-Ni-Nb alloy

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering

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