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The thermomechanically treated Ti-47%Al-1%Mn alloy was oxidized in air at 1073, 1173, and 1273 K. When compared to Ti-47%Al, the oxidation resistance of Ti-47%Al-1%Mn was better at 1073 K, slightly better at 1173 K, but poorer at 1273 K. The scale adherence was improved by the addition of Mn to a certain degree. The oxidation products were TiO 2 and α-Al 2 O 3 , together with a very small amount of MnTiO 3 , Mn 2 O 3 , TiN and Ti 2 AlN. Within the (TiO 2 , Al 2 O 3 ) oxide grains, some dissolution of Mn was noticed. The oxidation progressed via the outward diffusion of Ti ions to form the outer TiO 2 layer, and the inward transport of oxygen to form the inner (TiO 2 + Al 2 O 3 ) mixed layer, between which an intermediate Al 2 O 3 layer existed. Subsurface zone within the metal phase was depleted in Al.

High Temperature Oxidation of Ti-47%Al-1%Mn Alloy