Modelling Studies

Bulletin of Materials Science

, Volume 28, Issue 2, pp 179-185

First online:

Thermodynamic modelling of phase equilibria in Al-Ga-P-As system

  • S. AcharyaAffiliated withDepartment of Metallurgy, Indian Institute of Science
  • , J. P. HajraAffiliated withDepartment of Metallurgy, Indian Institute of Science Email author 

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A generalized thermodynamic expression of the liquid Al-Ga-P-As alloys is used in conjunction with the solid solution model in determining the solid-liquid equilibria at 1173 K and 1273 K. The liquid solution model contains thirtyseven parameters. Twentyfour of them pertain to those of the six constituent binaries, twelve refer to the specific ternary interactions. Additionally the liquid solution model also contains a specific quaternary interaction parameter. The latter has been evaluated here based on the experimental data available in the literature. The present research shows an excellent agreement between the derived and experimental values at 1173 K and 1273 K for the system. The article also presents a comparison between the evaluated values with those based on the regular solution model for the liquid alloys.


Excess free energy liquid solution model Al-Ga-P-As system solid-liquid equilibria solid alloys quaternary alloy