Effect of low temperature aging on superelastic behavior in biocompatible β TiNbSn alloy

F. Nozoe, H. Matsumoto, T. K. Jung, S. Watanabe, T. Saburi, S. Hanada

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Superelasticity of β Ti-16 at%Nb-4.8 at%Sn alloy consisting of non- (or minimal-) cytotoxic elements was investigated for biomedical applications as functions of deformation temperature and aging heat treatment after quenching. As-quenched Ti-16Nb-4.8Sn having Af (the reverse martensitic transformation finish temperature) of 266 K exhibits superelasticity at human body temperature (310K) with an elastic recovery strain of 3.2%. Af decreases with increasing aging temperature in the range of 353 to 423 K or with increasing aging time at 423 K. It is confirmed from TEM observation and Young's modulus measurements that ω transformation occurs on aging at 423 K for 500 h. Stress for inducing martensitic transformation, σM, increases with aging. Stress-strain curves showing superelasticity are quite similar to each other when as-quenched or aged samples are deformed at such temperatures that they have the same σM It is concluded that maximum superelastic recovery strain can be obtained at intended temperature, e.g. human body temperature, in β Ti-Nb-Sn alloys by aging at relatively low temperatures.

Original languageEnglish
Pages (from-to)3007-3013
Number of pages7
JournalMaterials Transactions
Volume48
Issue number11
DOIs
Publication statusPublished - 2007 Nov

Keywords

  • Aging
  • Biomaterial
  • Martensitic transformation
  • Superelasticity
  • Titanium-niobium-tin alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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