Abstract
In order to assure the reliability of advanced gas turbine systems, it is very important to evaluate the damage of high temperature materials such as Ni-base superalloy under creep and fatigue conditions quantitatively. The mechanism of the directional coarsening of γ phases (rafting) of the Ni-base superalloy under uniaxial strain at high temperatures was analyzed by molecular dynamics (MD) analysis. The stress-induced anisotropic diffusion of Al atoms perpendicular to the interface was observed clearly in a Ni(001)/Ni_3Al(001) interface structure. The stress-induced anisotropic diffusion was validated by experiment using the stacked thin film structure with the (001) face-centered cubic interface.
