Abstract
Improvement of oxidation behavior of TiAl due to Nb addition has been investigated. For TiAl fixed at 50at%Al, the optimum content of Nb was found to be in the vicinity of 10at%. The effect of Nb on rutile growth has been studied for TiNb alloys in order to estimate the role of Nb in TiAl. For TiNb alloys, rutile growth was remarkably suppressed when Ti was substituted by 1–10at% of Nb. However, higher Nb content yielded TiNb 2 O 7 formation and resulted in larger mass gain due to oxidation. It is difficult to interpret the best oxidation behavior found in TiAl containing 10at% Nb only in terms of rutile growth suppression, because Nb content of this alloy is supposed to be large enough to form TiNb 2 O 7 . It is suggested that an external alumina scale formed in the initial stage of oxidation serves to suppress further oxidation of the alloy.
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