Abstract
The isothermal oxidation kinetics of four different β-NbTi alloys with compositions of 85, 75, 60, and 50 at. pct titanium were studied using the thermogravimetric technique in the temperature range of 1073 to 1323 K at an interval of 50 K. Analysis of oxidation curves revealed that each alloy follows a complex paralinear oxidation reaction mechanism. X-ray diffraction analysis of oxidation products at each temperature revealed the simultaneous formation of TiO2 and TiNb2O7. Formation of the oxidation product TiO2 predominated at higher titanium concentration and that of the ternary compound TiNb2O7 predominated at higher niobium concentration in the β-NbTi alloys. However, in all cases, the formation of TiNb2O7 predominated at higher temperatures. The overall oxidation rate constants and the activation energies of oxidation reactions for each alloy composition were evaluated. It was observed that the overall oxidation rate constant initially decreases from pure titanium to Nb-85 at. pct Ti and then increases with further decrease in titanium concentration.
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