High temperature thermodynamic properties of iron-nickel alloys

Larrain, Jose M.

doi:10.1016/0364-5916(80)90021-8

Cited by 12 publications

(3 citation statements)

References 15 publications

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“…Larraine [9] gives data graphically, which convert to 12,100 J mol Ϫ1 and 64.4 J mol Ϫ1 K Ϫ1 , in excellent agreement. Calculating with the mixing parameters of Chuang et al [4] at 800 K and adding in their 4 magnetic correction at this temperature gives similar values 13,275 J mol Ϫ1 and 64.3 J mol Ϫ1 K Ϫ1 , well within reasonable error estimates.…”

Section: Comparison Of Calculations For the Disordered Ferromagnementioning

confidence: 81%

“…Spreadsheet calculations for binary systems The enthalpy of the paramagnetic face-centered cubic phase at a particular temperature is given by an equation with four parameters: [9] The two standard enthalpies, H o Ni and H o Fe , are strongly temperature dependent, but the Redlich-Kister coefficients A and B can be used over a wide temperature range. However, for other solid phases in the Fe-Ni system, a cubic in X is not adequate to represent the concentration dependence of the ϩ B*X Ni *(1 Ϫ X Ni )*(Ϫ1 ϩ 2*X Ni )…”

Section: Appendix Amentioning

confidence: 99%

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The thermodynamics of tetrataenite and awaruite: A review of the Fe-Ni phase diagram

Howald

2003

Metall Mater Trans A

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There are two well-known ordered ferromagnetic intermetallic compounds in the iron-nickel system: tetrataenite, FeNi, and awaruite, FeNi 3 . Their thermodynamic properties are established from the various stable and metastable equilibria in which they are involved, and a review to make this data accessible is appropriate. The Fe-Ni phase diagram shows a paramagnetic face-centered cubic phase (gamma) with well-measured properties over the entire composition range from 1184 to 1662 K. Its properties can be extrapolated to lower temperatures, and known stable and metastable equilibria are used to establish models for the thermodynamic properties of the ferromagnetic alpha phase, a high-temperature paramagnetic alpha phase, a paramagnetic gamma-ordered Fe 3 Ni phase, the ferromagnetic disordered gamma phase, and both ordered ferromagnetic gamma phases, tetrataenite, FeNi, and awaruite, FeNi 3 . The overestimate of Chuang et al. for the entropy of ordering in awaruite is corrected. The standard enthalpies at 298.15 K of tetrataenite (0.5 FeNi) and awaruite (0.25 FeNi 3 ) are Ϫ1170 and Ϫ3560 Ϯ1000 J mol Ϫ1 . The corresponding standard entropy values are 35.7 and 33.3 Ϯ3 J mol Ϫ1 K Ϫ1 . All the second-order transitions are accurately modeled and the full phase diagram is calculated. The spinodal regions and metastable equilibria responsible for the complex behavior on cooling of alloys with mole fractions of nickel between 0.26 and 0.40 are described in detail.

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Section: Comparison Of Calculations For the Disordered Ferromagnementioning

confidence: 81%

Section: Appendix Amentioning

confidence: 99%

The thermodynamics of tetrataenite and awaruite: A review of the Fe-Ni phase diagram

Howald

2003

Metall Mater Trans A

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“…In der Literatur angegebene Werte fur die Mischungswarmen HE, [l -131 und fur die thermodynamischen Aktivitaten aj [l, 6, 7, 9, 10, 14-16] [25] vorgenommen. Bei dem Gerat handelt es sich um ein modifiziertes Massenspektrometer der Reihe RMU-6 M (einfach fokussierend, magnetisches 90"-Sektorfeld Hitachi, Japan), welches rnit einer neuen Ionenquelle [26] versehen und mit einer Knudsenzellen-Einheit kombiniert wurde [25, 261. Die Ionenstromintensitaten Jj der Isotopen 56Fe und 58Ni wurden bei den 13 untersuchten Legierungszusammensetzungen innerhalb eines Temperaturbereiches von 90-170 Grad gemessen. Die Obergrenzen der untersuchten Temperaturintervalle lagen fur die einzelnen Proben jeweils mindestens 30 Kelvin unterhalb der von Hultgren et al [27] kompilierten Solidus-Temperaturen.…”

Section: Introductionunclassified

Thermodynamik fester Fe ‐Ni Legierungen: Massenspektrometrische Bestimmung der thermodynamischen Mischungseffekte und Berechnung des Schmelzdiagramms

Tomiska

Neckel

1985

Ber Bunsenges Phys Chem

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Thermodynamic investigations on solid Fe‐Ni alloys (f.c.c.‐phase) have been performed by means of a mass spectrometer in combination with a high temperature Knudsen cell unit. The “Algebraic Intensity‐Ratio”‐method (A.I.R.) has been applied for determing the thermodynamic excess functions. The molar excess Gibbs energies GE, the molar heats of mixing HE, and the molar excess entropies SE are negative over the whole range of composition. At 1623 K the minimum value of GE is ‐2350 J/mol (57.6 at % Ni), the minimum value of HE is ‐3950 J/mol (63.6 at % Ni), and the minimum value of SE is ‐1.04 J/mol K (70.2 at % Ni). The thermodynamic activities aj show slight negative deviations from Raoult's law. Using the results of this work, the thermodynamic results from mass spectrometric studies on liquid Fe ‐Ni alloys, and literature data for the enthalpies and heat capacities of Fe and Ni the phase diagram has been redetermined, using a generally applicable procedure for the calculation of the equilibrium compositions of coexisting phases. The applied procedure is based upon the generalized Newton method for the numerical solution of equations.

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