Centrifugal precision cast TiAl turbocharger wheel using ceramic mold

It is the potential candidate for gamma TiAl-based alloys that would replace Ni-based superalloys, which are being used in fabrication of the turbocharger wheel currently. Cast Ti–47Al–2Cr–2Nb alloys due to their specific performance requirement are now on the verge of a commercial application. A novel precision casting technique, which combines the ceramic mold casting with centrifugal casting, was described in this work. Multiple-section ceramic mold was designed and fabricated successfully. All the mold sections fit together to form a cavity and then open in many directions to eject the molded part. Microstructures and mechanical properties of cast Ti–47Al–2Cr–2Nb alloys under the action of centrifugal force are discussed.