The microstructures and creep properties at 760 °C and 276 MPa of three powder metallurgy TiAl alloys (Ti-48Al-2Cr-2Nb, Ti-48Al-2Cr-2Nb+0.5W, and Ti-48Al-2Cr-2Nb+1W (atomic percent)) are presented. The results indicate that the addition of W to the base composition, the use of a solution heat treatment combined with controlled cooling (to generate a fully lamellar microstructure), and the use of an aging heat treatment (to generate precipitate particles at the lamellar interfaces) improve creep properties dramatically. The solution heat treated and aged Ti-48Al-2Cr-2Nb+1W alloy has a time to 0.5% strain of 8.3 hours, a time to 1% strain of 46.4 hours, and a creep life of 412 hours with a rupture ductility of 16.9%. Copyright

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2007 ASME Turbo Expo
Department of Mechanical and Aerospace Engineering

Saari, H, Bulmer, S., Seo, D.Y., & Au, P. (2007). Microstructures and creep properties of powder metallurgy Ti-48Al-2Cr-2Nb + W. Presented at the 2007 ASME Turbo Expo. doi:10.1115/GT2007-27437