Effects of Co on Microstructure, Mechanical Properties, and Corrosion Resistance of Ti-Nb-Zr-Co Biological Alloys

Abstract

Since the excellent solid solution strengthening of the β-stabilizer (Co), Ti-24Nb-4Zr-XCo (X = 0.5, 1, 1.5 at.%) alloys are prepared in arc melting, cold rolled, and heat treated followed by air cooled (at 823 K and 1023 K for 1.2 ks). The results indicate that micro-additions of Co strongly affect the mechanical properties and corrosion resistance of β titanium alloys. XRD and OM analyses reveal that the Co enhances the recovery and recrystallization process and strengthens the stability of β phase against β → ω phase transformation. Tensile test and Vickers hardness test indicate that the tensile strength and hardness heighten with increasing Co content, while relatively high plastic strain is retained. The Ti-24Nb-4Zr-1.5Co alloy performs highest strength (about 700 MPa), high plastic strain (19%), and low elastic modulus (75 GPa), making it a prospective implant for biomedical applications. Electrochemical corrosion test shows that the corrosion resistance weakens with an increase in Co content due to effect of the ω phase, but addition of 1.5 Co can inhibit the precipitation of ω phase and prevent the deterioration to some extent.

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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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Correspondence to Fengcang Ma or Ping Liu.

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Zhao, J., Ma, F., Liu, P. et al. Effects of Co on Microstructure, Mechanical Properties, and Corrosion Resistance of Ti-Nb-Zr-Co Biological Alloys. J. of Materi Eng and Perform 29, 3736–3744 (2020). https://doi.org/10.1007/s11665-020-04874-y

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Keywords

  • Corrosion
  • Mechanical properties
  • Microstructure
  • Recrystallization
  • Ti-Nb-Zr-Co