A self-contained algorithm for determination of solid-liquid equilibria in an alloy system
- Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics
- Ames Lab., Ames, IA (United States)
- Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics; Univ. of Science and Technology of China, Hefei (China). Hefei National Lab. for Physical Sciences at the Microscale. Dept. of Physics
In this paper, we describe a self-contained procedure to evaluate the free energy of liquid and solid phases of an alloy system. The free energy of a single-element solid phase is calculated with thermodynamic integration using the Einstein crystal as the reference system. Then, free energy difference between the solid and liquid phases is calculated by Gibbs-Duhem integration. The central part of our method is the construction of a reversible alchemical path connecting a pure liquid and a liquid alloy to calculate the mixing enthalpy and entropy. We have applied the method to calculate the free energy of solid and liquid phases in the Al-Sm system. Finally, the driving force for fcc-Al nucleation in Al-Sm liquid and the melting curve for fcc-Al and Al3Sm are also calculated.
- Research Organization:
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Ames Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 1459538
- Report Number(s):
- IS--J 9689; PII: S0927025618302696
- Journal Information:
- Computational Materials Science, Journal Name: Computational Materials Science Vol. 150; ISSN 0927-0256
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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