Abstract
In this study, the highly ordered nanotube formation on beta typed Ti-xTa alloy surface was investigated. The Ti-xTa binary alloys were manufactured using a vacuum arc-melting furnace with varying Ta contents (10, 30, and 50 wt%), and then homogenized by heat treatment at 1050 °C for 1 h. The nanotube formation of Ti-xTa (x = 10-50 wt%) alloys were performed using a DC power source of 30 V in 1.0 M H₃PO₄ + 0.8 wt% NaF electrolyte solution for 2 hrs. The surface characterization was performed using field-emission scanning electron microscopy and energy-dispersive X-ray spectroscopy. The microstructure of Ti-xTa alloy showed martensite structure α', α″-phase, and a '-phase structure. As the Ta content increased, the needle-like structures of α' and α'-phase gradually disappeared and only the equiaxed structure of β-phase appeared. Nanotube morphology of Ti-xTa alloy changed according to Ta content. As the Ta content increased, the size of the nanotubes decreased and the number of the smaller nanotubes increased. In the cross-sectioned nanotube layer, the gap size between the nanotubes decreased as the Ta content increased.
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