Journal of Materials Science p. 1906 - 1910 (1988)
Update date:2022-08-11
Topics:
Subrahmanyam
Titanium aluminides are considered as replacements for superalloys in applications in gas turbine engines because of their outstanding properties. Ti//3Al has a superior creep strength up to 815 degree C, but has poor oxidation resistance above 650 degree C. Two approaches can be followed to improve the oxidation resistance of Ti//3Al above 650 degree C. One is alloying and the other obtaining a protective surface coating. Niobium was found to improve the oxidation resistance, when added as an alloying element. Recent investigations showed that a TiAl//3 surface layer considerably improves the oxidation resistance of titanium. In the present work, a TiAl//3 layer was obtained on a Ti-14Al-24Nb (wt percent) alloy using a pack aluminizing process. The cyclic oxidation behaviour of aluminized and uncoated samples was evaluated.
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Doi:10.1002/kin.10011
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