Phase-Field Simulation of the Effect of Elastic Inhomogeneity on Microstructure Evolution in Ni-Based Superalloys

Phase-field simulation is performed to examine the effect of elastic inhomogeneity between the gamma and gamma' phases on microstructure evolution of the gamma' phase in Ni-based superalloys. For solving the elastic equilibrium equation numerically in the elastically inhomogeneous system. an iterative approach is used. In this simulation, both elastic anisotropy and shear modulus are varied independently based on the elastic constants of practical Ni-based superalloy. Four different types of anti-phase domains in the gamma' phase are also considered in this simulation. The variation of clastic anisotropy affected significantly the manner of both morphology of the gamma' phase and distribution function of the gamma', particle size, whereas the variation of shear modulus did not affect them. [doi: 10.2320/matertrans.MBW200826]