Abstract
The solvus temperature, volume fraction, coarsening behavior of γ' precipitates and the partitioning behavior of alloying elements as well as lattice misfit of γ/γ' phases influence the creep behavior of Ni- and Co-base superalloys. However, few investigations about the microstructural characteristics and the coarsening behavior of γ' precipitates were reported in multicomponent novel Co-base superalloys during thermal exposure. Two alloys containing different contents of molybdenum and tungsten have been investigated to explore the effect of molybdenum on γ' solvus temperature, γ+γ' microstructure and γ' coarsening in Co–Al–W–Ta–Ti-base alloys. The results showed that the γ' solvus temperature decreases with the addition of Mo. Mo addition reduces the γ' volume fractions after aging above 1000°C, but results in negligible influence on the γ' volume fractions aging at 900°C. Meanwhile, γ' coarsening is controlled by diffusion in experimental alloys after aging at 900°C and 1000°C, and the kinetics of γ' growth in experimental alloys are consistent with the predictions of LSW theory.
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