Thermodynamic assessments of the Fe-Y and Ni-Sc systems

Kardellass, S.; Servant, C.; Selhaoui, N.; Iddaoudi, A.; Amari, Malika; Bouirden, L.

doi:10.1051/matecconf/20130301008

Cited by 8 publications

(11 citation statements)

References 33 publications

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“…[100] The calculated Gibbs energy data from the present study is slightly lower than the experimental values. But the previous assessments [90][91][92]107] show a much larger deviation from the experimental data. The enthalpy of formation data also shows similar results.…”

Section: The Fe-y (Iron-yttrium) Systemmentioning

confidence: 64%

“…The phase diagram depicted is identical to that assessed from the present study, except no terminal solid solutions were considered. Kardellass et al [92,107] presented a phase diagram with considerable homogeneity range in the Y 6 Fe 23 and YFe 2 phase without any experimental evidence. Several investigators [108,109] reported the presence of a stoichiometric phase, without any solid solubility of Fe in Y 6 Fe 23 .…”

Section: The Fe-y (Iron-yttrium) Systemmentioning

confidence: 99%

“…The Fe-Y system has been assessed by Du et al, [90] Lu et al [91] and Kardellass et al [92,107] Du et al [90] assessed the thermodynamic properties of the liquid and solid phases, where the Gibbs energy of compounds was significantly different from the experimental data in Fig. 32.…”

Section: The Fe-y (Iron-yttrium) Systemmentioning

confidence: 99%

“…Several investigators [108,109] reported the presence of a stoichiometric phase, without any solid solubility of Fe in Y 6 Fe 23 . Kardellass et al [92,107] did not consider the terminal solid solutions of Y and Fe in their assessment.…”

Section: The Fe-y (Iron-yttrium) Systemmentioning

confidence: 99%

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Critical Systematic Evaluation and Thermodynamic Optimization of the Fe-RE System: RE = Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y

Konar

Kim

Jung

2017

J. Phase Equilib. Diffus.

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As the second part of the thermodynamic study of binary Fe-RE system, critical evaluations and optimizations of all available phase diagrams and thermodynamic data for the Fe-heavy RE (heavy RE = Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y) systems were conducted to obtain reliable thermodynamic functions of all the phases in the systems. In the thermodynamic modeling of the heavy RE systems, systematic variations in the phase diagrams and thermodynamic properties such as the enthalpy of mixing in the liquid state and enthalpy of formation of solid compounds with the atomic number of lanthanide series were observed. These systematic trends were incorporated in the optimization of the Fe-heavy RE system to resolve inconsistencies between available experimental data and to estimate unknown thermodynamic properties. The systematic trends in thermodynamic properties of solid and liquid phases and phase diagram of the entire Fe-RE systems were summarized.

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Section: The Fe-y (Iron-yttrium) Systemmentioning

confidence: 64%

Section: The Fe-y (Iron-yttrium) Systemmentioning

confidence: 99%

Section: The Fe-y (Iron-yttrium) Systemmentioning

confidence: 99%

Section: The Fe-y (Iron-yttrium) Systemmentioning

confidence: 99%

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Critical Systematic Evaluation and Thermodynamic Optimization of the Fe-RE System: RE = Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y

Konar

Kim

Jung

2017

J. Phase Equilib. Diffus.

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“…To clarify this question, we need to survey a number of binary systems of scandium with metals, which show relatively similar degrees of interaction between the components to the Co-Sc system [10,38,[41][42][43][44][45][46][47][48][49][50][51][52][53].…”

Section: Discussionmentioning

confidence: 99%

Thermodynamic properties of alloys of the Co-Sc and Co-Y systems

Shevchenko

Иванов

Berezutski

et al. 2015

Russ. J. Phys. Chem.

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The thermochemical properties of melts of the Co-Sc(Y) systems were studied by the calorimetry method at 1873 K over the wide concentration intervals. It was shown that moderate negative heat effects of mixing are characteristic for these melts. Using the ideal associated solution (IAS) model, the activities of components, mixing Gibbs energies and entropies in the alloys of these systems, and their phase diagrams were calculated, and they agree well with the data from literature and undergo the general dependences for the Fe(Co, Ni, Cu)-d-metal systems.The alloys containing cobalt, which are the base of most heat-resistant and structural materials, are used in aircraft industry, turbine construction, and other important fields of the national economy. As magnetic and high-temperature materials, they have valuable applications in many areas. That is why goods made of them demand high-grade alloys. As the quality of solid alloys is mostly imprinted at the casting stage, both manufacturing and welding of the cobalt alloys need optimal, scientifically based techniques, oriented towards their physicochemical properties.The Co-Y alloys are promising materials with a wide range of unique physical and mechanical properties (particularly, a class of cobalt-containing compounds with rare-earth elements provides significant interest owing to their outstanding magnetic properties). It is known that multicomponent alloys based on the binary Co-Y system (for instance, Al-Co-Y) at certain compositions can be obtained in amorphous state [1,2]. To search these compositions, it is important to know the thermodynamic properties of the melts. Scandium has high durability, hardness, atmosphere-proof qualities, and even in small quantities it gives a set of those valuable properties to the aluminum-based alloys [3], which can also contain cobalt. To develop the most rational methods of obtaining and exploiting these alloys, as well as the Co-Sc(Y)-metal alloys, the precise information on their thermodynamic features is needed. THE Co-Sc SYSTEMThe phase diagram of the Co-Sc system was for the first time constructed in [4], where the phase equilibria in the composition range 0 < x Sc < 0.8 were studied, and then it was revised in the works [5][6][7].Accordingly to [8], the enthalpy of formation of the Co 2 Sc intermetallic is -32.5 kJ/mol at., and of the CoSc 2 -26.7 kJ/mol at. These values were obtained by direct synthesis calorimetry at 1473 K.In [9] the authors investigated the mixing enthalpies of the Co-Sc system at 1873 K in the range 0 < x Sc < 0.15. At x Sc = 0.15, the integral mixing enthalpy was found to be -13.2 ± 0.3 kJ/mol.The only attempt to systematize all known thermodynamic properties of alloys of the Co-Sc system was made in the work [10], where the following concentration dependences of the enthalpies and excess entropies of mixing of these melts were obtained: However, these results are supported mostly by the data [9], which have too narrow concentration range.

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Estimation of Enthalpy of Formation of Liquid Transition Metal Alloys: A Modified Prescription Based on Macroscopic Atom Model of Cohesion

Raju

Saroja

2016

Metall Mater Trans A

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Thermodynamic assessments of the Fe-Y and Ni-Sc systems

Cited by 8 publications

References 33 publications

Critical Systematic Evaluation and Thermodynamic Optimization of the Fe-RE System: RE = Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y

Critical Systematic Evaluation and Thermodynamic Optimization of the Fe-RE System: RE = Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y

Thermodynamic properties of alloys of the Co-Sc and Co-Y systems

Estimation of Enthalpy of Formation of Liquid Transition Metal Alloys: A Modified Prescription Based on Macroscopic Atom Model of Cohesion

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