Materials Research (Nov 2017)

Microstructure and Mechanical Properties of Ti-12Mo-8Nb Alloy Hot Swaged and Treated for Orthopedic Applications

  • Aline Raquel Vieira Nunes,
  • Sinara Borborema Gabriel,
  • Carlos Angelo Nunes,
  • Leonardo Sales Araújo,
  • Renato Baldan,
  • Paulo Mei,
  • Loïc Malet,
  • Jean Dille,
  • Luiz Henrique de Almeida

DOI
https://doi.org/10.1590/1980-5373-mr-2017-0637
Journal volume & issue
Vol. 20, no. suppl 2
pp. 526 – 531

Abstract

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Metastable β-type Ti alloys with non-toxic addition elements such as Mo, Zr, Sn, Ta and Nb were developed as an alternative to the widely used Ti-6Al-4V alloy for biomedical applications. These alloys possess enhanced biocompatibility and reduced elastic modulus in comparison with Ti-6Al-4V. Moreover, for orthopedic implants, low Young's modulus is required in order to avoid the stress shielding phenomenon. This study analyzes the microstructure and mechanical properties of a new Ti-12Mo-8Nb alloy after hot swaging, annealing at 950 ºC for 1h and water quenching. The alloy was characterized by X-ray diffraction, optical microscopy and transmission electron microscopy. Tensile tests were performed at room temperature. Young's modulus and hardness values were also measured. The structural characterization reveals a metastable β structure containing only a small amount of α and ω phases. Exhibiting a lower Young's modulus than Ti-6Al-4V and other previously studied Ti-Mo-Nb alloys, the Ti-12Mo-8Nb alloy can be a promising alternative for orthopedic application.

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