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A self-contained algorithm for determination of solid-liquid equilibria in an alloy system

Journal Article · · Computational Materials Science
 [1];  [2];  [2];  [2];  [2];  [1];  [3]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics
  2. Ames Lab., Ames, IA (United States)
  3. 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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Cited By (2)

Effects of dopants on the glass forming ability in Al-based metallic alloy journal February 2019
Effects of Dopants on the Glass Forming Ability in Al-Based Metallic Alloy journal January 2018

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