Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10620809 | Acta Materialia | 2009 | 9 Pages |
Abstract
The phase-field method is used to develop a new technique to simulate γⲠprecipitation in multicomponent Ni-base superalloys. This technique generates the Gibbs free energy for both the γ and γⲠphases from the single function formalism of both phases in the CALPHAD method without using conventional CALPHAD software. The Gibbs free energy surfaces for eight-element multicomponent systems are used to confirm that there is an accurate coupling with the CALPHAD method, because they compare favorably with calculated results from Thermo-Calc. In addition, γⲠprecipitation in a third-generation Ni-base superalloy containing eight components is simulated in one dimension with anti-phase effects of the γⲠphase on the precipitate interactions. The simulation results reveal late-stage enrichments of Re and W in the γ phase during coalescence of the γⲠprecipitates.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
T. Kitashima, H. Harada,