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Prediction of thermodynamic activities in binary iron-based alloys using two-point Padé approximants

  • Eduardo Stella and Jorge Stella
Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 99 Issue 9

Abstract

A method for predicting activities as a function of the concentration in liquid solutions for binary FeCo, FeCu, FeNi, FeMn and FePd systems using Padé approximants is presented. Padé approximants of orders 4/0 and 1/3 are proposed for the model using as input variables only the conditions from Henry's law at a given temperature. Results derived from the approximant 4/0 show good agreement with the experimental data in systems with moderate positive and negative deviations from the Raoultian behaviour. On the other hand, the approximant 1/3 shows a satisfactory agreement in the FeCu system which exhibits a high positive deviation from the Raoultian behaviour. A comparison with the results from a Redlich – Kister expansion using the same input conditions is discussed.

Keywords: Activities; Binary solutions; Padé approximants; Gibbs – Duhem; Iron-based alloys
* Correspondence address, Dr. Jorge Stella, Materials Science Department, Universidad Simón Bolívar, Valle de Sartenejas, Caracas 1080, Venezuela, Tel.: +58 212 9063940, Fax: +58 212 9063932, E-mail:

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Received: 2007-9-4
Accepted: 2008-6-13
Published Online: 2013-06-11
Published in Print: 2008-09-01

© 2008, Carl Hanser Verlag, München

Articles in the same Issue

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  2. Contents
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  5. Are data correctly fitted by the sin2 ψ and similar methods?
  6. Liquidus surface projection of the Fe–Co–C ternary system in the iron-rich corner
  7. Prediction of thermodynamic activities in binary iron-based alloys using two-point Padé approximants
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  10. The effect of cooling rate on the microstructure and mechanical properties of Mg–Zn–Gd-based alloys
  11. The effect of thermal exposure on the microstructure and hardness of as-cast Mg–Zn–Al alloys with Sn addition
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  14. Microstructure and some properties of FeCr25Co15 alloy subjected to plastic deformation by complex load
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  16. Suitability of maraging steel weld cladding for repair of die casting tooling
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  18. Thermodynamic consideration and experimental study on the preparation of heat-treated hollow nickel fibres
  19. A model for the intrinsic kinetic parameters of the direct reduction of MoS2 with hydrogen
  20. Notification
  21. DGM News
https://doi.org/10.3139/146.101724
Keywords for this article
Activities; Binary solutions; Padé approximants; Gibbs – Duhem; Iron-based alloys

Articles in the same Issue

  1. Contents
  2. Contents
  3. Basic
  4. Critical temperature for massive transformation in ultra-low-carbon Fe–C alloys
  5. Are data correctly fitted by the sin2 ψ and similar methods?
  6. Liquidus surface projection of the Fe–Co–C ternary system in the iron-rich corner
  7. Prediction of thermodynamic activities in binary iron-based alloys using two-point Padé approximants
  8. Study of fatigue dislocation structures in [233] coplanar double-slip-oriented copper single crystals using SEM electronic channelling contrast
  9. Microstructures at high temperature of Fe-30 wt.% Cr-xC Alloys with x varying from 0 to 2 wt.%
  10. The effect of cooling rate on the microstructure and mechanical properties of Mg–Zn–Gd-based alloys
  11. The effect of thermal exposure on the microstructure and hardness of as-cast Mg–Zn–Al alloys with Sn addition
  12. Applied
  13. Deformation and fracture of Ti-base nanostructured composite
  14. Microstructure and some properties of FeCr25Co15 alloy subjected to plastic deformation by complex load
  15. Determination of the concentration dependent diffusion coefficient of nitrogen in expanded austenite
  16. Suitability of maraging steel weld cladding for repair of die casting tooling
  17. Catalytic performance of Fe-, Pd-, and Pd–Fe- mordenites in simulated hydrocarbon-selective catalytic reduction of N2O by methane in a model flue-gas from nitric acid plants
  18. Thermodynamic consideration and experimental study on the preparation of heat-treated hollow nickel fibres
  19. A model for the intrinsic kinetic parameters of the direct reduction of MoS2 with hydrogen
  20. Notification
  21. DGM News
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