4.7 Article

Low cycle fatigue and stress relaxation behaviours of powder metallurgy Ni-based superalloy FGH4098

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Summary: This study investigates the differences in creep behavior of polycrystalline Ni-based superalloys with two different Nb contents, attributing the mechanical performance variation to phase transformations along planar faults. The presence of stacking faults and their composition in the alloys are analyzed using electron channeling contrast imaging and atom probe tomography, revealing insights into the underlying mechanisms of creep strain rate differences. The findings suggest a potential atomic-scale driven alloy design approach for enhancing creep resistance by promoting local phase transformations along planar faults at 750 degrees C.

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