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| Effect of sintering process on microstructure and properties of medical Ti-Nb-Ta-
Zr alloy |
| LI Bo-qiong，XIE Rui-zhen，LI Chun-lin |
| School of Mechanical Engineering，Jinzhong College，Jinzhong 030619，China |
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Abstract β titanium alloy with low modulus has become a research hotspot in biomedical implant materials because
of its excellent biocompatibility. Ti-Nb-Ta- Zr alloy with non- toxic alloying elements has been developed
widely for biomaterials due to its high strength and significant plasticity. In this paper，Ti-35Nb-7Zr-5Ta alloy was
prepared by traditional powder metallurgy method in order to further regulate the uniformity. Based on the distribution
of microhardness，the uniformity of phase distribution was analyzed according to the uniformity index and
hardness variation coefficient. The effect of sintering process on the microstructure and mechanical properties of Ti-
35Nb-7Zr-5Ta alloy was studied. The experimental results show that with the increase of sintering temperature and
holding time，the pore size of the matrix decreases gradually or even disappears，resulting in the phase compositions
and distribution changing accordingly. The Young's modulus of Ti-35Nb-7Zr-5Ta alloy increases firstly and
then decreases within（4.77±0.48）-（7.4±0.81）GPa，which is close to that of cancellous bone. In the simulated
body fluid environment，the impedance spectrum of the sintered Ti-35Nb-7Zr-5Ta alloy exhibits a semi-capacitive
arc-resistance characteristic，and the phase angle has a peak value in the wide frequency domain of 10－1-102 Hz. It
indicates that the sintered Ti-35Nb-7Zr-5Ta alloy has high corrosion resistance and provides a theoretical basis for
the study of biomechanical properties of medical titanium alloys.
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Received: 17 February 2020
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2020, Vol. 30 
