| The oxidation behavior and morphological changes of Ti-6Al-4V alloy have been investigated in air over the temperatures ranging from 973K to 1273K. The phases of oxidation product have teen examined by X-ray diffractometer and scanning electron microscopy. They are composed of films of TiO₂ and Al₂O₃ mixture. The weight gains during the oxidation increase rapidly at temperature above 973K, which obey the parabolic law. The oxidation behavior of Ti-6A1-4V alloy lead to breakaway oxidation at high temperature, which is similar to that, of pure Ti. However, the oxidation rate of Ti-6Al-4V alloy is higher than that of pure Ti, because a porous mixture film of TiO₂ and α-Al₂O₃ formed in Ti-6Al-4V alloy is less protective than TiO₂ film formed in pure Ti. The growth rate of TiO₂ oxides in Ti-6Al-4V alloy is faster than that of α-Al₂O₃ at high temperature. |
|
