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. 2020 Apr 28;5(3):564-568.
doi: 10.1016/j.bioactmat.2020.04.014. eCollection 2020 Sep.

Microstructure, mechanical property and corrosion behavior of porous Ti-Ta-Nb-Zr

B Q Li  1 , R Z Xie  1 , X Lu  2
Affiliations

Microstructure, mechanical property and corrosion behavior of porous Ti-Ta-Nb-Zr

B Q Li et al. Bioact Mater. .

Abstract

In this paper, biomedical porous Ti-Nb-Ta-Zr with 40% porosity and 166 ± 21 μm macro-pore size was successfully fabricated by space holder method. The microstructure, Vickers hardness, compressive and electrochemistry behavior were studied. It results that a few second phases exist in β matrix of the porous Ti-Nb-Ta-Zr. Its Young's modulus is 0.8 GPa, close to 0.01-3 GPa for trabecular bone. The total recovery strain ratio and pseudoelastic strain ratio are 8.8% and 2.7%, respectively. It fails mainly by brittle cleavage with the fan-shaped and smooth cleaved facets. Although, local ductile fracture by a few dimples and a small amount of transcrystalline fracture with the cleavage of similarly oriented laths in a colony are observed on the fracture surface. The impedance spectrum of porous Ti-Nb-Ta-Zr has the characteristics of half capacitive arc resistance, showing good corrosion resistance in SBF solution.

Keywords: Compressive property; Electrochemistry behavior; Macro-pore structure; Porous Ti–Nb–Ta–Zr alloy.

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Conflict of interest statement

There is no conflict of interest.

Figures

Image 1
Graphical abstract
Fig. 1
Fig. 1
Equivalent circuit.
Fig. 2
Fig. 2
Microstructure of Powder (a) and porous TNTZ alloy (b) and XRD diffraction (c).
Fig. 3
Fig. 3
EBSD results of TNTZ alloy: (a) Phase distribution; (b) Grain distribution; (c) Grain size distribution.
Fig. 4
Fig. 4
Micro-hardness distribution of porous TNTZ.
Fig. 5
Fig. 5
Stress-strain curve of porous TNTZ alloy.
Fig. 6
Fig. 6
SEM fractography of the porous TNTZ under compression showing: (a) macro-cracks, (b) cleavage facets, (c) transcrystalline fracture and (d) micro-voids.
Fig. 7
Fig. 7
The Nyqust diagram of solid (a) and porous TNTZ (b).
Fig. 8
Fig. 8
The Bode diagram of solid (a) and porous (b) TNTZ.
See this image and copyright information in PMC

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