Rafting behaviour of nickel-based superalloys

The microstructure in Ni-base superalloys is formed by second-phase coheren t precipitates gamma ' in matrix material gamma. Volume fraction, local dis tribution and shapes of the inclusions affect the excellent high temperatur e properties of these materials. Coherency-influenced and, due to an extern al load, strain-induced coarsening perpendicular or parallel to the load di rection can also be observed. To describe this rafting called process, a mo del will be proposed taking into account arbitrary elastic anisotropy and i sotropic interfacial energy. To simulate typical microstructures with sever al distributed inclusions, a 2D Monte Carlo-type finite element formulation is presented.