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Journal of Materials Science

, Volume 52, Issue 6, pp 3062–3073 | Cite as

The evolution of microstructure and microhardness in a biomedical Ti–35Nb–7Zr–5Ta alloy

  • M. Hendrickson
  • S. A. Mantri
  • Y. Ren
  • T. Alam
  • V. Soni
  • B. Gwalani
  • M. Styles
  • D. Choudhuri
  • R. BanerjeeEmail author
Original Paper

Abstract

β-Ti alloys are promising candidates for biomedical applications due to their high strength, high corrosion and wear resistance, and low elastic modulus. This study focuses on phase evolution in a low modulus Ti–35Nb–7Zr–5Ta (TNZT) alloy, systematically examined via isochronal and isothermal annealing, and its influence on microhardness. The observations indicate that the highest microhardness value was achieved at an aging temperature of 400 °C. The microstructural evolution at this temperature was investigated via systematic isothermal annealing treatments, and the results indicate a progressive transformation from β + ω + O’ (solution treated and quenched) to β + ω + α (after isothermal annealing at 400 °C/6 h), with the dissolution of the metastable orthorhombic O’ phase and the formation of the stable α phase. The maximum hardness corresponded to a highly refined mixture of co-existing ω and α phases after prolonged annealing for 48 h at 400 °C. The coexistence of both ω and α phases after such prolonged annealing indicates that at 400 °C, ω is in metastable equilibrium, despite the concurrent precipitation of the equilibrium α phase.

Keywords

Zone Axis Phase Fraction Isothermal Annealing Atom Probe Tomography Annealed Specimen 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

DC and RB would like to thank the funding sources NSF Grant #1309277 and #1435611.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • M. Hendrickson
    • 1
  • S. A. Mantri
    • 1
  • Y. Ren
    • 2
  • T. Alam
    • 1
  • V. Soni
    • 1
  • B. Gwalani
    • 1
  • M. Styles
    • 3
  • D. Choudhuri
    • 1
  • R. Banerjee
    • 1
    Email author
  1. 1.Department of Materials Science and EngineeringUniversity of North TexasDentonUSA
  2. 2.X-ray Science Division, Advanced Photon SourceArgonne National LaboratoryDentonUSA
  3. 3.CSIRO ManufacturingClayton South ClaytonAustralia

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