Bending springback behavior related to deformation-induced phase transformations in Ti-12Cr and Ti-29Nb-13Ta-4.6Zr alloys for spinal fixation applications

J Mech Behav Biomed Mater. 2014 Jun:34:66-74. doi: 10.1016/j.jmbbm.2014.01.013. Epub 2014 Jan 25.

Abstract

The springback behavior of Ti-12Cr and Ti-29Nb-13Ta-4.6Zr (TNTZ) during deformation by bending was investigated; and the microstructures of the non-deformed and deformed parts of both alloys were systematically examined to clarify the relationship between microstructure and springback behavior. For the deformed Ti-12Cr alloy, deformation-induced ω-phase transformation occurs in both the areas of compression and tension within the deformed part, which increases the Young׳s modulus. With the deformed TNTZ alloy, deformation-induced ω-phase transformation is observed in the area of compression within the deformed part; while a deformation-induced α″ martensite transformation occurs in the area under tension, which is likely to be associated with the pseudoelasticity of TNTZ. Among these two alloys, Ti-12Cr exhibits a smaller springback and a much greater bending strength when compared with TNTZ; making Ti-12Cr the more advantageous for spinal fixation applications.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alloys / chemistry*
  • Chromium / chemistry*
  • Compressive Strength
  • Elastic Modulus*
  • Materials Testing*
  • Niobium / chemistry*
  • Phase Transition*
  • Spine / surgery*
  • Stress, Mechanical
  • Surgical Fixation Devices
  • Tantalum / chemistry*
  • Titanium / chemistry*
  • Zirconium / chemistry*

Substances

  • Alloys
  • Ti-29Nb-13Ta-4.6Zr alloy
  • Niobium
  • Chromium
  • Tantalum
  • Zirconium
  • Titanium