The life cycle requirements for advanced Ni alloys are very demanding and can be on the order of several hundred thousand hours. Results are presented on a wrought Ni-based superalloy with a fixed amount of y' strengthening phase, and either low Al or Ti (within the alloy specification). The effect that these changes have on the y' misfit and its relevance to long term microstructural stability will be explored both experimentally as well as with computational modeling through 10,000 hours. Results on each alloy formulation are compared and discussed with respect to the long term stability o f the alloy. 361
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