The structure of the γ/γ’ phase interface in a Ni-based single-crystal superalloy was simulated by molecular dynamics, using an embedded atom method potential. From the calculated results, it was found that 3 dislocation network patterns; square, rectangle and equilateral triangle, appeared on {100}, {110} and {111} interphase interfaces, respectively. The dislocation networks consisted of 4 edge dislocations (<011>{100}, <¯110>{110}, <001>{110} and <112> {111}). The energy of the γ/γ’ phase interface for {100}, {110} and {111} planes was 271, 240 and 32mJ/m2. The side length of the network was 166.8Å for the square, 166.8 and 235.8Å for the rectangle and 166.8Å for the equilateral triangle. The relationship between the size of the network and the mismatch was presented quantitatively. The calculated results could be supported by recent experiments.

Misfit Dislocation Networks in the γ/γ’ Phase Interface of a Ni-Based Single-Crystal Superalloy - Molecular Dynamics Simulations. T.Zhu, C.Wang: Physical Review B, 2005, 72[1], 014111 (6pp)