Method to refine the microstructure of -2 titanium aluminide- based cast and ingot metallurgy articles

摘要

The microstructure of alpha-2 and orthorhombic titanium aluminide alloy cast and ingot metallurgy articles is refined by: (a) hydrogenating the article at a temperature at or slightly below the - transus temperature of the alloy; (b) cooling the article, under a positive partial pressure of hydrogen, to a temperature about 20 to 40 percent below the -transus; and (c) dehydrogenating the article.