Ti-6Al-4V合金在500℃-700℃熱空氣中短暫氧化行為

The Oxidation Behaviour of Ti-6Al-4V Alloy between 500 and 700℃ for a short period in Air

Ti-6Al-4V合金在500℃-700℃熱空氣短暫氧化行為中主要為氧離子往內擴散，鋁原子往外擴散，在600℃以上發現鈦原子往外擴散較明顯，鋁有往外堆積（pile up）的現象。釩在700 ℃以上有明顯氧化現象並且有加速鈦氧化的作用，使得氧化膜快速成長。在氧化層與基材之界面鋁無法氧化。最內層氧化物為緊臨並且平行基材生長的TiO，中間層主要為較厚並且垂直基材生長之TiO2為主與Al2O3的複合型氧化層，最外層則是較薄且平行基材生長的TiO2。

Air oxidation behaviour of Ti-6Al-4V alloy was studied in the temperature range between 500-700℃for a short period. Oxygen ions diffuse inward and aluminum atoms diffuse outward. Significant pile-up of titanium and aluminum near the oxide/substrate interface and outermost surface respectively were observed above 600℃. Oxidation of vanadium was observed above 700℃. The existence of vanadium in titanium accelerates oxidation rate and thus increases the thickness of oxide scale. Alumina was never found at the oxide/substrate interface. TiO was always found at oxide/substrate interface and grew parallel to the interface. The external air/oxide interface was always occupied by parallel thinner Ti02 whilst thicker mixed oxide scale formed on the TiO2/ TiO interface.