The United States of America As Represented by the Administrator of the

The United States of America Government As Represented by the

Michael P Brady

James L Smialek

William J Brindley

A coating for protecting titanium aluminide alloys, including the TiAl .gamma.+Ti.sub.3 Al (.alpha..sub.2) class, from oxidative attack and interstitial embrittlement at temperatures up to at least 1000.degree. C. is disclosed. This protective coating consists essentially of titanium, aluminum, and chromium in the following approximate atomic ratio:

Two-phase (TiAl+TiCrAl) coating alloys for titanium alumnides

A diffusion barrier to help protect titanium aluminide alloys, including the coated alloys of the TiAl.gamma.+Ti.sub.3 Al (.alpha..sub.2) class, from oxidative attack and interstitial embrittlement at temperatures up to at least 1000.degree. C. is disclosed. The coating may comprise FeCrAlX alloys. The diffusion barrier comprises titanium, aluminum, and iron in the following approximate atomic percent:

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Cleveland, OH, United States of America

Michael P Brady