Effect of annealing treatment on microstructure and properties of a high Zr-containing Ti-Zr-Nb-Sn alloy
In order to investigate the effect of annealing process on microstructure and properties of Ti-49Zr-21Nb-1Sn alloy after cold rolling,it was annealed at 850 ℃ for 10,20 and 40 min,respectively.Microstructure,mechanical properties and corrosion performance of the alloy after annealing at 850 ℃ for different time were studied using optical microscope,X-ray diffractometer(XRD),scanning electron microscopy(SEM),nano indentation instrument,electrochemical workstation and X-ray photoelectron spectroscopy(XPS).The results show that with the increase of annealing time,the grain size of the alloy significantly grows,the phase composition remains unchanged,is single β phase,the elastic recovery of the alloy slightly increases,while the plasticity index slightly decreases.The elastic modulus,H/Er and H3/Er2 values of the alloy after annealing vary between 88.4-94 GPa,0.0463-0.0479,and 0.0088-0.0103 GPa,respectively.The analysis results of polarization curves and electrochemical impedance spectroscopy(EIS)show that with the increase of annealing time,the self-corrosion current density of the alloy gradually increases,and the capacitance arc radius decreases.When the annealing time is 10 min,the self-corrosion current density of the alloy is the smallest,and the capacitance arc radius is the largest,indicating good corrosion resistance.
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