The Regular Solution Model for Stoichiometric Phases and Ionic Melts.

Hillert, Mats; Staffansson, L. I.

doi:10.3891/acta.chem.scand.24-3618

Cited by 1,214 publications

(392 citation statements)

References 0 publications

Supporting

Mentioning

376

Contrasting

Unclassified

Order By: Relevance

“…Thus, the Gibbs energy of one formula unit of such a phase u, Fe a (C,N,Va) c , where Va denotes a vacant site on the interstitial sublattice, and with integers a and c, the ratio of which is determined by the crystal structure, can be described as (Hillert-Staffanson approach, also called compound-energy formalism [46][47][48] )…”

Section: A Thermodynamics Of Interstitial Solid Solutionsmentioning

confidence: 99%

The $$\upalpha +\upvarepsilon $$ Two-Phase Equilibrium in the Fe-N-C System: Experimental Investigations and Thermodynamic Calculations

Göhring

Leineweber

Mittemeijer

2016

Metall Mater Trans A

View full text Add to dashboard Cite

The present work is dedicated to investigating the occurrence of the a þ e equilibrium at temperatures typically applied for nitrocarburizing treatments. To this end, pearlitic Fe-C specimens were treated between 823 K and 863 K (550°C and 590°C) in gaseous nitriding and gaseous nitrocarburizing atmospheres, allowing control of the chemical potentials of N and C. Subsequently, the resulting compound-layer microstructures were investigated using light microscopy and X-ray diffraction. Thermodynamic calculations, adopting several models for the Fe-N-C system from the literature, were performed, showing significantly different predictions for both the sequence of the invariant reactions and their temperatures. Comparison of the experimental data and the theoretical calculations led to the conclusion that none of the models from the literature is able to realistically describe the experimentally observed constitution in the Fe-N-C system in the considered temperature range. Values/value ranges for the temperatures of the invariant reactions were obtained.

show abstract

Section: A Thermodynamics Of Interstitial Solid Solutionsmentioning

confidence: 99%

The $$\upalpha +\upvarepsilon $$ Two-Phase Equilibrium in the Fe-N-C System: Experimental Investigations and Thermodynamic Calculations

Göhring

Leineweber

Mittemeijer

2016

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…[61] In the following, only an Fe-N-C solid solution phase is considered; a similar treatment is used for an Fe-N (and an Fe-C) solid solution phase.…”

Section: Thermodynamic Model Of the Fe-n And Fe-n-c Solid Solutiomentioning

confidence: 99%

Thermodynamics of the Fe-N and Fe-N-C Systems: The Fe-N and Fe-N-C Phase Diagrams Revisited

Göhring

Fabrichnaya

Leineweber

et al. 2016

Metall Mater Trans A

View full text Add to dashboard Cite

Several thermodynamic descriptions of the Fe-N and Fe-N-C systems were proposed before now. The results of these descriptions significantly deviate from more recently obtained experimental data. The present work provides a revised thermodynamic description of these systems. The new description for the Fe-N system agrees distinctly better with the experimental data especially for the equilibrium of c 0 -Fe 4 N 1Àx and e-Fe 3 N 1+z . The new thermodynamic description for the Fe-N-C system considering the Fe-rich part of the system with less than 33 at. pct N and less than 25 at. pct C excellently agrees with the new experimental data for both the temperatures of the invariant reactions and the phase boundaries. This in particular concerns the temperature range of typical technical nitriding and nitrocarburizing treatments [723 K to 923 K, (450°C to 650°C)], within which three invariant reactions occur in the ternary system.

show abstract

“…[4,5] . Following the suggestion, based on crystallographic data, [20] of Du et al, [5] the Al 8 Mn 5 phase was modeled by the compound energy formalism [42,43] as Al 12 Mn 5 (Al,Mn) 9 (the first sublattice containing only Al, the second only Mn and the third a random mixture of Al and Mn). The optimized phase diagram for the region from 0.2 £ X Mn £ 0.5 is compared with experimental data in Fig.…”

Section: Modified Quasichemical Modelmentioning

confidence: 99%

Thermodynamic Assessment of the Al-Mn and Mg-Al-Mn Systems

Shukla

Pelton

2008

J. Phase Equilib. Diffus.

View full text Add to dashboard Cite

The binary Al-Mn system has been critically evaluated based upon available phase equilibrium and thermodynamic data, and optimized model parameters have been obtained giving the Gibbs energies of all phases as functions of temperature and composition. The liquid solution has been modeled with the modified quasichemical model to account for short-range ordering. The results have been combined with those of our previous optimizations of the Al-Mg and Mg-Mn systems to evaluate and optimize the Mg-Al-Mn system. All available data for the ternary system are reproduced with only one small ternary model parameter for the liquid phase.

show abstract

The Regular Solution Model for Stoichiometric Phases and Ionic Melts.

Cited by 1,214 publications

References 0 publications

The $$\upalpha +\upvarepsilon $$ Two-Phase Equilibrium in the Fe-N-C System: Experimental Investigations and Thermodynamic Calculations

The $$\upalpha +\upvarepsilon $$ Two-Phase Equilibrium in the Fe-N-C System: Experimental Investigations and Thermodynamic Calculations

Thermodynamics of the Fe-N and Fe-N-C Systems: The Fe-N and Fe-N-C Phase Diagrams Revisited

Thermodynamic Assessment of the Al-Mn and Mg-Al-Mn Systems

Contact Info

Product

Resources

About