Journal ArticleDOI
Thermodynamics and phase diagram of the Fe-C system
TLDR
A critical review of published data provides a fairly accurate knowledge of the thermodynamic properties of all of the phases of the system Fe-C that are stable or metastable at atmospheric pressure as discussed by the authors.Abstract:
A critical review of published data provides a fairly accurate knowledge of the thermodynamic properties of all of the phases of the system Fe-C that are stable or metastable at atmospheric pressure. Selected data are shown as tables and equations. A proposed phase diagram differs only slightly from others recently published but has the following features. Peritectic compositions and the α-γ equilibrium are shown to agree with measured values of the activity of iron in the solid and liquid solutions and the thermodynamic properties of pure iron. Of all the reported carbides of iron only two may be studied under equilibrium conditions. The solubilities of cementite and of χ-carbide in α-Fe are deduced from measured equilibria. Both are metastable at all temperatures with respect to graphite and its saturated solution in iron. The χ-carbide becomes more stable than cementite below about 230° Certain published data on e-carbide permit an estimate of its free energy as a precipitate during the aging process.read more
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Experimental study and thermodynamic calculations of phase relations in the Fe-C system at high pressure
Yingwei Fei,Eli Brosh +1 more
TL;DR: In this paper, the phase relations of the Fe-C binary system were interpolated and extrapolated over a wide pressure and temperature range, and a comprehensive thermodynamic model was established to understand the role of carbon during inner core crystallization, predicting carbon distribution between the inner and outer cores and mineralogy of the solid inner core.
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Partitioning of carbon between Fe-rich alloy melt and silicate melt in a magma ocean - Implications for the abundance and origin of volatiles in Earth, Mars, and the Moon
TL;DR: In this article, the authors determined the solubility of carbon in coexisting Fe-Ni alloy melt and basaltic silicate melt in shallow MO conditions, i.e., at 1-3 GPa, 1500-1800°C.
Journal ArticleDOI
Computer Calculation of Phase Diagrams of Iron Alloys
Taiji Nishizawa,Mitsuhiro Hasebe +1 more
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Cohesive properties and vibrational entropy of 3d-transition metal carbides
TL;DR: Guillermet and Grimvall as discussed by the authors made an extensive study of cohesive properties such as the enthalpy of formation Δ0H and the standard vibrational entropy 0S at 298.15 K of metal carbides.
Journal ArticleDOI
Cohesive properties and vibrational entropy of 3d transition-metal compounds: MX (NaCl) compounds (X=C, N, O, S), complex carbides, and nitrides
TL;DR: The method allows an estimate of cohesive properties and the vibrational entropy in systems where there is no, or uncertain, experimental information, and extends the correlation to carbides and nitrides of more complex structure, for which not much is known about the electron states.
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