Misfit dislocation at the γ/γ' interface of Ni-based superalloys was investigated using the quasi-continuum simulation. In order to imitate the γ' phases, nickel embedding function was modified by changing the lattice parameter, bulk modulus and cohesive energy simultaneously. Negative and positive misfits with different magnitudes were set in the simulations. Atomic structure at the interface, spatial distance and strain energy density at the core dislocation were investigated. Shear simulation was also conducted for a flat interface of γ/γ' laminates, while the dislocation propagation and it's interaction with interface were analyzed.

Computational Study on Misfit Dislocation in Ni-Based Superalloys by Quasicontinuum Method. J.R.P.Djuansjah, K.Yashiro, Y.Tomita: Materials Transactions, 2008, 49[11], 2507-14