### Abstract

Interfaces of A-B-C ternary alloys decomposed into two and three phases are studied. The effect of the gradient energy coefficients κ_{II}, I = A, B, C, on the interface composition profiles of ternary alloys is examined. The adsorption of component C in ternary alloys is obtained numerically by finding steady-state solutions of the nonlinear Cahn-Hilliard equations and by solving the two Euler-Lagrange equations resulting from minimizing the interfacial energy, and analytically near the critical point. It is found that the solutions from both numerical methods are identical for a two-phase system. In symmetric ternary systems (equal interaction energy between each pair of components) with a minority component C, the gradient energy coefficient of C, κ_{CC}, can have a very strong influence on the degree of adsorption. In the α and β two-phase regions, where α and β are the phases rich in the majority components A and B, respectively, as κ_{CC} increases, the adsorption of the minority component C in the α and β interfaces decreases. Near a critical point, however, the degree of adsorption of minority component C is independent of the gradient energy coefficient.

Original language | English (US) |
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Pages (from-to) | 4449-4459 |

Number of pages | 11 |

Journal | Acta Materialia |

Volume | 47 |

Issue number | 17 |

DOIs | |

State | Published - Nov 26 1999 |

### Keywords

- Interface
- Phase equilibria
- Spinodal decomposition
- Thermodynamics

### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys

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## Cite this

*Acta Materialia*,

*47*(17), 4449-4459. https://doi.org/10.1016/S1359-6454(99)00229-3