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Effects of Nb on Superelasticity and Low Modulus Properties of Metastable β-Type Ti-Nb-Ta-Zr Biomedical Alloys

  • Juan Chen
  • Fengcang MaEmail author
  • Ping Liu
  • Chaohu Wang
  • Xinkuan Liu
  • Wei Li
  • Qingyou Han
Article

Abstract

In this work, a series of Ti-xNb-2Ta-3Zr (x = 25, 30, 35, 40 wt.%) alloys are designed, and the transformation of β-phase to α″ martensitic, β-phase stability, microstructure, mechanical properties and corrosion performance of these alloys are investigated. The phase analysis shows as the Nb content increases, the α″ phase in these alloys decreases, while the intensity of the two main peaks β(110) and β(211) of Ti-40Nb-2Ta-3Zr alloy is reduced. These results can be attributed to the variation of β-phase stability caused by Nb element of alloy and cold rolling process. The mechanical properties test shows that the elastic modulus (52 GPa) of the Ti-35Nb-2Ta-3Zr alloy is the lowest and the elongation (18.8%) is the maximum. In addition, the alloy is susceptible to β-phase elastic deformation and stress-induced martensitic transformation resulting in the highest recovery strain of the alloy (66.87%). The polarization curves show that the Ti-35Nb-2Ta-3Zr alloy has the highest corrosion potential (− 0.34 V) and the lowest corrosion current density (0.21 μA cm−2) exhibiting the best corrosion resistance.

Keywords

low modulus martensitic transformation metastable β titanium alloy superelasticity Ti-Nb alloys 

Notes

Acknowledgments

The authors acknowledge financial support provided by National Natural Science Foundation of China (Grant No. 51771119), Natural Science Foundation of Shanghai (Grant No. 17ZR1419600) and Scientific and Technological Key Project of Shanghai (Grant Nos. 11441900500 and 11441900501).

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Juan Chen
    • 1
  • Fengcang Ma
    • 1
    Email author
  • Ping Liu
    • 1
  • Chaohu Wang
    • 1
  • Xinkuan Liu
    • 1
  • Wei Li
    • 1
  • Qingyou Han
    • 2
  1. 1.School of Materials Science and EngineeringUniversity of Shanghai for Science and TechnologyShanghaiChina
  2. 2.Department of Mechanical Engineering TechnologyPurdue UniversityWest LafayetteUSA

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