Abstract
AbstractThree single-crystalline Ni-base superalloys with varying content of the γ′ phase are investigated with respect to their microstructure and creep behaviour at 1000 °C. It is shown by convergent beam electron diffraction, X-ray diffraction and energy-dispersive X-ray spectroscopy that the composition of the matrix and precipitates as well as the lattice misfit between both phases are similar for all three model alloys despite a variation of the γ′ content from about 50 to about 65 %. This allows to study the influence of the precipitate volume fraction on high-temperature behaviour in separation from other microstructural parameters. Highest creep strength is found for the alloy with intermediate particle content (about 58 %), which is significantly below the particle volume fraction of contemporary single-crystal superalloys such as CMSX-4.
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