Abstract
Initial-stage oxidation characteristics of a γ-TiAl alloy were investigated by using in situ environmental scanning electron microscopy for both heating and isothermal oxidation processes. Selective oxidation led to primary nucleation and growth on the aluminum-rich γ phase. Under different isothermal oxidation times, the oxide morphology changed to a linear structure between 750 °C and 774 °C and to an acicular structure at 800 °C. The initial oxidation process of γ-TiAl alloy could be divided into three stages: nucleation; growth; and morphological transformation and subsequent growth stages.
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