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The early stages of Ti–46.5Al–5Nb (at%) oxidation at 900°C have been investigated combined with TEM and STEM. The results reveal that a layer composed of polycrystalline TiO 2 and amorphous Al 2 O 3 phase formed firstly after 5-min oxidation. The base alloy connected with the oxide scale has some deformation compared with the inner full lamellar TiAl structure. After 30-min...
In the present work, microstructure of oxide scale of Ti–46.5Al–5Nb oxidized for 50h at 900°C in air was investigated in both plane-viewed and cross-sectional samples using transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). In the TiO 2 and Al 2 O 3 mixture layer, orientation relationships (OR) between the Al 2 O 3 and...
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