Abstract
The corrosion behavior of TiAl alloy consisting of a single γ phase was examined at 1373 K for up to 3.6 Ms in an impure He gas environment (He-2′). During the test the alloy was oxidized and carburized and three kinds of corrosion products of Al 2O 3, Ti 2AlC, and Ti 3Al were formed on the specimen surface. Ti 3Al was formed also along the grain or twin boundaries in the specimen interior. The oxidation rate of the alloy followed a parabolic rate law. Its rate constant was much smaller than that of a NiCrW alloy and was comparable to that of a Ni-based ODS alloy. Due to lack of the thermodynamic data on Ti 2AlC, Ti 3Al, etc., it was impossible to construct a perfect phase stability diagram of the constituent elements of the alloy. Evaluations based on the calculation revealed that after 2.52 Ms exposure time, Ti 2AlC diminished accompanying the formation of Al 2O 3 and Ti 3Al owing to oxidation and decarburization.
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