Mechanical properties and microstructures of β Ti-25Nb-11Sn ternary alloy for biomedical applications

Taek Kyun Jung, Satoshi Semboshi, Naoya Masahashi, Shuji Hanada

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

The mechanical properties and microstructures of β Ti-25%Nb-11%Sn ternary alloy rods were investigated for biomedical applications as a function of heat treatment temperature after swaging by an 86% reduction in cross-section area. An as-swaged rod consisting of a β (bcc) single phase shows a low Young's modulus of 53 GPa, which is interpreted in terms of both the metastable composition of the β alloy undergoing neither an athermal ω transformation nor a deformation-induced ω transformation and < 110>texture development during swaging. Heat treatment at 673 K (400 C) for 2 h leads to a high strength of approximately 1330 MPa and a high spring-back ratio of yield stress to Young's modulus over 15 × 10- 3, with acceptable elongation. This high strength is attributable to needle-like α precipitates, which are identified by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and high-resolution electron microscopy (HREM).

Original languageEnglish
Pages (from-to)1629-1635
Number of pages7
JournalMaterials Science and Engineering C
Volume33
Issue number3
DOIs
Publication statusPublished - 2013 Apr 1

Keywords

  • Strength
  • Young's modulus
  • α precipitation
  • β titanium alloy

ASJC Scopus subject areas

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

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