The study on the formation and growth of topological close-packed compounds was important to understand the performance of turbine blades in jet engine applications. These deleterious phases grow mainly by diffusion process in the superalloy substrate. Significant volume change was found because of growth of the μ phase in Co–Mo system. Growth kinetics of this phase and different diffusion parameters, like interdiffusion, intrinsic and tracer diffusion coefficients were calculated. Further the activation energy, which provides an idea about the mechanism, was determined. Moreover, the interdiffusion coefficient in Co(Mo) solid solution and impurity diffusion coefficient of Mo in Co were determined.

Topological Close Packed Μ Phase Formation and the Determination of Diffusion Parameters in the Co–Mo System. V.D.Divya, U.Ramamurty, A.Paul: Intermetallics, 2010, 18[2], 259-66