Abstract
The creep behavior of nickel and titanium aluminides, molybdenum silicides, and their composites was evaluated as a function of stress and temperature to identify the effect of reinforcements on the creep resistance of these compounds. The deformation behavior was analyzed using a power-law creep equation. The experimentally determined activation energies and stress exponents were related to the rate-controlling mechanisms for each system. With reinforcements, there is no improvement in the creep strength in TiAl, some improvement in NiAl, particularly at low stresses, and notable improvement in MoSi and its alloys. Comparative analysis of the creep resistance of aluminides, silicides and the currently used superalloys was also provided. On the basis of the creep resistance, it was concluded that MoSi and its composites have high potential for application at temperatures greater than 1000 °C, and that they are potential competitors to somewhat more brittle ceramic-ceramic composites.
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