Fig. 1. OM, FE-SEM, and EDS results for homogenized Ti-25Ta-xHf alloy: (a, a-1 and a-2) Ti-25Ta, (b, b-1 and c-1) Ti-25Ta-15Hf.
Fig. 2. XRD patterns for homogenized Ti-25Ta-xHf alloy
Fig. 3. FE-SEM images of PEO-treated Ti-25Ta-xHf alloy with different anodizing voltages: (a, b and c) Ti-25Ta, (d, e, and f) Ti-25Ta-15Hf.
Fig. 4. FE-SEM images of PEO-treated Ti-25Ta-xHf alloy at 300V: (a) Ti-25Ta and (b) Ti-25Ta-15Hf.
Fig. 5. A schematic diagram of voltage and current - time during the PEO processing. VA : Voltage of inflection point A, TA : Time of inflection point A, TB : Time of inflection point B, Ta : Time of inflection point a, Tb : Time of inflection point b.
Fig. 6. Voltage-time and current density-time curves duing PEO of (a) Ti-25Ta and (b) Ti-25Ta-15Hf alloys at constant current and then constant applied voltages.
Fig. 8. Number, area and size of micro-pores in PEO films on Ti-25Ta and Ti-25Ta-15Hf alloys.
Fig. 9. TF-XRD patterns of PEO-treated (a) Ti-25Ta and (b) Ti-25Ta-15Hf alloys.
Fig. 7. Pore distribution images of Fig. 3 by using imageJ program: (a, a-1, and a-2) Ti-25Ta, (b, b-1, and b-2) Ti-25Ta-15Hf.
Table 1 Experimental conditions for plasma electrolytic oxidation.
Table 2 Time to A and B points in voltage-time curves and a and b points in current density-time curves for PEO treatments of Ti-25Ta and Ti-25Ta-15Hf alloys.
Table 3 The variation of crystallite size with applied voltage on the PEO-treated surface.
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