Thermodynamic description of the Al-Mg-Si system using a new formulation for the temperature dependence of the excess Gibbs energy

Ying Tang, Yong Du, Lijun Zhang, Xiaoming Yuan, G. Kaptay

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

An exponential formulation was proposed to replace the linear interaction parameter in the Redlich-Kister (R-K) polynomial for the excess Gibbs energy of ternary solution phase. The theoretical analysis indicates that the proposed new exponential formulation can not only avoid the artificial miscibility gap at high temperatures but also describe the ternary system well. A thermodynamic description for the Al-Mg-Si system and its boundary binaries was then performed by using both R-K linear and exponential formulations. The inverted miscibility gaps occurring in the Mg-Si and the Al-Mg-Si systems at high temperatures due to the use of R-K linear polynomials are avoided by using the new formulation. Besides, the thermodynamic properties predicted with the new formulation confirm the general thermodynamic belief that the solution phase approaches to the ideal solution at infinite temperatures, which cannot be described with the traditional R-K linear polynomials.

Original languageEnglish
Pages (from-to)131-142
Number of pages12
JournalThermochimica Acta
Volume527
DOIs
Publication statusPublished - Jan 10 2012

Fingerprint

Gibbs free energy
Polynomials
Thermodynamics
formulations
thermodynamics
temperature dependence
Solubility
polynomials
miscibility gap
Ternary systems
Temperature
energy
Thermodynamic properties
ternary systems
thermodynamic properties
interactions
temperature

Keywords

  • Al alloys
  • CALPHAD
  • Exponential interaction parameters
  • Gibbs energy
  • Thermodynamic stability

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Instrumentation

Cite this

Thermodynamic description of the Al-Mg-Si system using a new formulation for the temperature dependence of the excess Gibbs energy. / Tang, Ying; Du, Yong; Zhang, Lijun; Yuan, Xiaoming; Kaptay, G.

In: Thermochimica Acta, Vol. 527, 10.01.2012, p. 131-142.

Research output: Contribution to journalArticle

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