Effect of Sn content on microstructure and properties of high Zr-containing Ti-Zr-Nb alloy
Ti-49Zr-21Nb-xSn(x=0,0.5,1.0,2.0 and 4.0 mass％)alloys were prepared by non-self-consuming vacuum electric arc furnace.The effect of different contents of Sn elements on microstructure,mechanical properties and corrosion resistance of the alloys was studied using X-ray diffraction(XRD),scanning electron microscopy(SEM),universal testing machine,electrochemical workstation and X-ray photoelectron spectroscopy(XPS).The results show that with the increase of Sn element content,the grain size of the alloys is significantly refined,and the phase composition is mainly composed of β phase.When the Sn element content exceeds 2％,(Ti+Zr)5(Nb+Sn)3 phase precipitates at grain boundaries.The strength of the alloys first increases and then decreases with the increase of Sn element content.When the Sn element content is 1％,the tensile strength and yield strength of the alloy reach their maximum,reaching 1121 and 1085 MPa,respectively,with an elongation of 23.9％.When Sn element is not added,the corrosion resistance of the alloy is the best.After adding Sn element,the corrosion resistance of the alloy gradually decreases.When the Sn content is 1％,the self-corrosion current density of the alloy is relatively lower and the corrosion resistance is better.Therefore,the Ti-49Zr-21Nb-1Sn alloy has high mechanical properties and good corrosion resistance,demonstrating good comprehensive properties as a biomedical material.
NETL
NSTL
万方数据
