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Updated: Mar 13, 2026

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Solute lean Ti-Nb-Fe alloys: An exploratory study.

Camilo A F Salvador1, Mariana R Dal Bó1, Fernando H Costa1

  • 1School of Mechanical Engineering, University of Campinas, Brazil.

Journal of the Mechanical Behavior of Biomedical Materials
|October 22, 2016
PubMed
Summary
This summary is machine-generated.

Researchers optimized titanium-niobium-iron (Ti-Nb-Fe) alloys for low elastic modulus and cost-effectiveness. The Ti-19Nb-2.5Fe alloy achieved the lowest modulus (83±4 GPa) by controlling phase formation through specific heat treatments.

Keywords:
Alloy designMechanical propertiesPhase transformationsQuenchingTitanium alloys

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Area of Science:

  • Materials Science
  • Metallurgical Engineering
  • Biomaterials

Background:

  • Titanium (Ti) based alloys are critical for biomedical applications due to their biocompatibility and mechanical properties.
  • Reducing the elastic modulus of Ti alloys is essential to minimize stress shielding in orthopedic implants.
  • The Ti-Nb-Fe system offers potential for developing cost-effective, low-modulus alloys.

Purpose of the Study:

  • To investigate the Ti-Nb-Fe system for optimal compositions with low elastic modulus and reduced niobium (Nb) content.
  • To explore the effect of iron (Fe) substitution for Nb on alloy properties and phase stability.
  • To identify cost-effective Ti-Nb-Fe alloys suitable for biomedical applications.

Main Methods:

  • Preparation of six Ti-(31-4x)Nb-(1+0.5x)Fe (wt%) alloy ingots, varying Fe and Nb content.
  • Application of thermomechanical treatments: cold rolling, recrystallization, solution treatment, followed by water-quenching (WQ), furnace cooling (FC), or step-quenching.
  • Characterization of phase formation (α, β, ω phases), microstructure, and mechanical properties (compressive strength, elastic modulus) using techniques including DSC.

Main Results:

  • Fe addition improved compressive strength in all alloys.
  • Furnace cooling (FC) promoted α phase formation and suppressed ω phase, leading to a solute-rich β phase.
  • The Ti-19Nb-2.5Fe alloy, subjected to FC, exhibited the lowest elastic modulus (83±4 GPa) with fine α precipitation and no ω phase.

Conclusions:

  • The Ti-Nb-Fe system allows for tuning of phase stability and mechanical properties through Fe content and heat treatment.
  • The Ti-19Nb-2.5Fe alloy represents a promising candidate for low-modulus, cost-effective biomaterials.
  • Understanding phase transformations, particularly the role of ω and α phases, is crucial for designing advanced Ti alloys.