Abstract
In order to simulate multi-component diffusion in a Ni-base superalloy using the phase-field method, the Gibbs free energy of the γ and γ ′ phases in the quaternary Ni-Al-Re-Ta superalloy system was linked to the CALPHAD method using a four-sublattice model. The free energy curve and phase equilibrium compositions in this work were in good agreement with the results of the Thermo-calc calculation, indicating that the model was successfully linked to the CALPHAD method. A one-dimensional phase-field simulation showed a pileup of Re at the γ / γ ′ interface during the growth of precipitates as well as a spike of the Re concentration in a γ ′ phase, accompanied by precipitate coalescence.
| Original language | English |
|---|---|
| Pages (from-to) | 239-245 |
| Number of pages | 7 |
| Journal | Intermetallics |
| Volume | 16 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 2008 |
Keywords
- B. Phase transformation
- E. Phase stability, prediction
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