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DICTRA used to Model Changes to Ni-based Superalloy During Interdiffusion


In a  paper published in the January 2016 issue of Journal of Phase Equilibria and Diffusion , Vol. 37 No. 2 2016, the homogenization model within DICTRA, together with the TCNI and MOBNI databases, were used to model the interdiffusion processes in the Ni-based superalloy CMSX-10 and was shown to have good agreement with experimental values.

The paper, Modeling Interdiffusion Processes in CMSX-10/Ni Diffusion Couple , was written by A. Chyrkin, A. Epishin, R. Pillai, T. Link, G. Nolze and W.J. Quadakkers.


A diffusion couple between directionally solidified nickel and the single crystal Ni-base superalloy CMSX-10 was produced by hot pressing in vacuum. The diffusion couples were heat treated at temperatures between 1050 and 1250 °C. The exposed samples were characterized by SEM/EBSD/EPMA. The interdiffusion results in dissolution of the γ′-Ni3Al in the superalloy and in growth of nickel grains towards CMSX-10. Rapid diffusion of aluminum from the superalloy into pure nickel leads to a significant formation of pores in the superalloy. The interdiffusion processes were modelled using the finite-element simulation software DICTRA with the databases TCNi5 and MobNi2, tailored specially for Ni-base superalloys. The effect of alloying elements on the interdiffusion profiles is discussed in terms of alloy thermodynamics. The calculated element concentration profiles are in good agreement with the EPMA measurements. The interdiffusion modeling correctly predicts the shapes of the concentration profiles, e.g. kinks on the Al and Ti profiles in the vicinity of the original interface in the joint. The calculation predicts with reasonable accuracy the extent and the location of the Kirkendall porosity.

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