Effects of Ti content on the microstructure, mechanical properties and corrosion behavior of TixZrNb alloys

Abstract

The study reports the effects of Ti content on microstructures, mechanical properties and corrosion behavior of the TixZrNb alloys. The BCC phase TixZrNb (x = 1, 1.5 and 2 mol) alloys have a typical dendritic morphology. With the increase of Ti content, the dendrite arms grow up, and the area of the inter-dendritic zone decreases. Furthermore, the segregation of Zr elements forms the βZr phase. Ti1ZrNb alloy has the highest yield strength of 516 MPa and hardness of 254 HV, and the Ti1.5ZrNb alloy shows the best elastic deformation performance (n = 0.46). The potentiodynamic polarization curve and electrochemical impedance spectroscopy show that Ti1.5ZrNb alloy has better electrochemical corrosion behavior than other alloys in 3.5 wt.% NaCl solution at 25 °C. The cyclic polarisation curve shows that Ti2ZrNb alloy is more prone to pitting corrosion in 3.5 wt.% NaCl solution.