Effect of Sintering Temperature on Properties of Ti-29Nb-4Mo-13Ta-9Zr Alloy for Biomedical Applications

In order to improve the comprehensive mechanical properties and corrosion resistance of titanium alloy used as medical implant materials,Ti-29Nb-4Mo-13Ta-9Zr alloy was prepared by powder metallurgy.The effects of sintering temperature on the phase compositions,microstructure,compressive strength,elastic modulus and electrochemical corrosion of the alloy were studied by X-ray diffraction,metallographic microscope,scanning electron microscope,compression test and potentiodynamic polarization curve test.The results indicate that the stable β phase structure in Ti-29Nb-4Mo-13Ta-9Zr alloy can be formed and the density of the alloy gradually increases with increase of the sintering temperature.At 1 350 ℃ of sintering temperature,the compressive strength of the alloy is 780 MPa and the elastic modulus is about 66 GPa,which improves the comprehensive mechanical adaptability of the alloy.Potentiodynamic polarization curves exhibit that Ti-29Nb-4Mo-13Ta-9Zr alloy sintered at 1 350 ℃ has a self-corrosion voltage of-187.09 mV and self-corrosion current of 11.172 μA/cm²,indicating a better corrosion resistance.Thus,Ti-29Nb-4Mo-13Ta-9Zr alloy is a potential material for implant applications.