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A theoretical model for slip irreversibility in a polycrystalline nickel-base superalloy has been developed. This alloy deforms in a planar manner, and the slip irreversibility parameter was based on the fraction of dislocations which exit the free surface as a result of the loading. Defined in this manner, the slip irreversibility parameter can take values between zero, which corresponds to fully...
Fatigue crack propagation fracture surface morphologies in nickel-base superalloys vary substantially with changes in loading parameters such as temperature, ΔK, load ratio, frequency, and additionally microstructure. Quantitative fracture surface roughness can vary from sub-micron levels to a maximum value of approximately half the grain size. Atomic Force Microscope studies of surface slip traces...
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