Abstract
In order to clarify degradation mechanisms of Ni-base superalloy under creep or fatigue condition, the mechanism of the directional coarsening of y' phases (rafting) under uni-axial strain was analyzed by molecular dynamics (MD) analysis. Stress-induced anisotropic diffusion of Ni and Al atoms in γ' phases perpendicular to the interface was observed around the simulated γ/γ' interface structure. Therefore, reduction of strain-induced anisotropic diffusion is effective for decreasing the evolution of the rafting and improving the creep or fatigue resistance of the Ni-base superalloy.
