Abstract
The growth of surface oxide films on binary aluminium alloys with transition metal (TM) Ti, Zr and Hf additives at temperatures 600 and 620° С in air was studied using the single-wave ellipsometry method (wavelength 0.6328 µm). It was shown that the annealing temperature affects the growth rate and extinction coefficient of surface oxide films for alloys having ∼5 at.% and ∼18 at.% TM in aluminium. Alloys with hafnium demonstrated the most active growth of oxide films during heating. A considerable increase in the extinction coefficients of oxide films was observed during oxidation of Al ∼18 at.% TM alloys. The optical properties of alloys (substrates) were found to correlate with their chemical composition. The aluminium alloys with 6 and 18.5 at.% Ti retain their resistance to thermal oxidation in air at the indicated temperatures.
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