Abstract
Intermetallic titanium aluminides, such as the advanced TNM alloy, find application in the automotive and aircraft engine industries due to their attractive high-temperature properties. Here, creep resistance combined with microstructural stability represent determining criteria in increasing the application temperature. Thus, the effect of C and Si additions to a conventional TNM alloy was investigated with special regard to microstructural stability during creep at 815 °C and 150 MPa. Alloying with C and Si led to improved microstructural stability as well as creep resistance due to retarding the kinetics of cellular reaction by a solid solution effect. Additionally, the precipitation of carbides in the lamellae during creep process partially compensated the negative influence of cellular reaction on creep.
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