共查询到20条相似文献,搜索用时 31 毫秒
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Cuiping Wang Yihui Guo Yong Lu Xingjun Liu 《Journal of Phase Equilibria and Diffusion》2014,35(3):269-275
The thermodynamic assessment of the binary system Ti-Ir has been carried out by modeling the Gibbs energy of all individual phases using the calculation of phase diagrams approach based on the available literature data including the phase equilibria and thermodynamic properties. The Gibbs free energies of the liquid, bcc, fcc and hcp phases were described by the subregular solution model with Redlich-Kister formula, and those of the intermetallic compounds (Ti3Ir, γTiIr, βTiIr and TiIr3) in the Ti-Ir binary system were described by the two-sublattice model. The calculations are in good agreement with the literature data on both phase equilibria and thermodynamic properties in the Ti-Ir system. 相似文献
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A thermodynamic optimization of the boron-cobalt-iron ternary system is performed based on thermodynamic models of the three constitutional binary systems and the experimental data on phase diagrams and thermodynamic properties of the ternary system. The liquid, fcc_A1, bcc_A2 and hcp_A3 solution phases are described by the substitutional solution model. The three intermediate line compounds, (Co,Fe)B, (Co,Fe)2B and (Co,Fe)3B, are described by the two sublattice model. A set of thermodynamic parameters are obtained. The calculated phase diagram and thermodynamic properties are in reasonable agreement with most of the experimental data. 相似文献
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《Intermetallics》2007,15(10):1332-1336
A thermodynamic assessment of the binary Gd–Sb system was performed through the CALPHAD approach (CALculation of PHAse Diagram) based on the evaluation of all phase diagram data and available thermodynamic data in the literature. The liquid, hcp-A3 (αGd) and bcc-A2 (βGd) phases were described by a substitutional solution model. All the intermediate phases, Gd5Sb3, Gd4Sb3, βGdSb, αGdSb and Gd16Sb39, were treated as stoichiometric compounds. A set of self-consistent thermodynamic parameters of the Gd–Sb system has been obtained. A good agreement is obtained between the experimental and the calculated phase diagrams. 相似文献
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S. L. Wang J. L. Li L. L. Qiu L. J. Zhou Y. H. Li C. Q. Ren C. Y. Fu Y. H. Lin C. P. Wang X. J. Liu 《Journal of Phase Equilibria and Diffusion》2016,37(3):319-326
The thermodynamic assessments of the Au-Tb and Au-Lu binary systems were carried out by means of the CALPHAD method based on the experimental data including the thermodynamic properties and phase equilibria. The Gibbs free energies of the liquid, bcc, fcc and hcp phases were described by the substitutional solution model, while all of the intermetallic compounds (Au6Tb, Au51Tb14, Au3Tb, Au2Tb, Au10Tb7, Au4Tb3, αAuTb, βAuTb, AuTb2, Au4Lu, Au3Lu, Au2Lu, AuLu and AuLu2 phases) in these two binary systems were treated as the sublattice model. Consequently, a set of self-consistent thermodynamic parameters of each phase in the Au-Tb and Au-Lu binary systems has been obtained, and the calculated results are in good agreement with the available experimental data. 相似文献
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Cong Zhang Chuanlong Zhao Haiqing Yin Xuanhui Qu Yong Du 《Journal of Phase Equilibria and Diffusion》2018,39(6):766-777
The C-Mo-Zr system was assessed by means of the CALPHAD approach. All of the phase equilibria available from the literature were critically reviewed. The liquid was modeled as substitutional solution phase, while the carbides including fcc-(Mo,Zr)C1?x, bcc-(Mo), bcc-(Zr), hcp-Mo2C, hcp-(Zr) and η-MoC were described by using corresponding sublattice models. The laves-Mo2Zr and shp-MoC phases were considered as binary compounds with no solubility for the third component. The existence of ternary phase was not reported in this system. The modeling of C-Mo-Zr ternary system covers the entire composition and temperature ranges, and a set of self-consistent thermodynamic parameters for the C-Mo-Zr system was systematically optimized. Comprehensive comparisons between the calculated and reported phase diagram data show that the reliable information is satisfactorily accounted for by the present modeling. The liquidus projection and reaction scheme of the C-Mo-Zr system were also generated based on the present thermodynamic assessment. 相似文献
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S. L. Wang Z. B. Hu F. Gao C. P. Wang X. J. Liu 《Journal of Phase Equilibria and Diffusion》2011,32(5):441-446
By using the calculation of phase diagrams (CALPHAD) method, the thermodynamic assessments of the Bi-Tb and Bi-Y systems were
carried out based on the available experimental data including thermodynamic properties and phase equilibria. Gibbs free energies
of the liquid, hcp, bcc, and rhombohedral phases in the Bi-Tb and Bi-Y systems were modeled by the substitutional solution
model, and the intermetallic compounds (BiTb, Bi3Tb4, αBi3Tb5, βBi3Tb5, BiY, and Bi3Y5 phases) in these two binary systems were described by the sublattice model. An agreement between the present calculated results
and experimental data was obtained. 相似文献
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Joo -Youl Huh 《Metals and Materials International》1997,3(2):75-86
We present a generalized way of treating phase equilibria in coherent planar multilayers. A correct recognition of elastic stress and strain components as thermodynamic potentials or densities is crucial for the use of the criteria for intrinsic stability as well as for the applicability of the conventional method of common tangent construction and the Gibbs phase rule. It is shown that a method analogous to the conventional common tangent construction exists in thermodynamic density subspaces for which some of density variables are held constant. In a thermodynamic density subspace withm s density variables fixed, a common tangent construction can be made between the extremized free energies for systems of (ms+l)-phase coexistence in order to satisfy the thermodynamic equilibrium conditions of systems with more thanm s+1 coexisting phases. This method is applied to a coherent binary system configured as plane-parallel plates to demonstrate that equilibrium states with more than two coexisting phases cannot be thermodynamically stable in the binary multilayer system under certain mechanical loading conditions. 相似文献
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Taufiq Hidayat Denis Shishin Sergei A. Decterov Evgueni Jak 《Journal of Phase Equilibria and Diffusion》2017,38(4):477-492
Phase equilibria and thermodynamic data in the FeO-Fe2O3-SiO2 system were critically reviewed. New experiments were undertaken to resolve discrepancies found in previous data. The liquid oxide/slag phase was described using the modified quasichemical model. New optimized parameters of the thermodynamic models for the Gibbs energies of slag and other phases in the selected system were obtained. The new parameters reproduce all available phase equilibria and thermodynamic data within the experimental error limits from 298 K (25 °C) to above the liquidus temperatures at all compositions and oxygen partial pressures from metal saturation to 1 atm of O2. This study was carried out as part of the development of a self-consistent thermodynamic database for the Al-Ca-Cu-Fe-Mg-Si-O-S multi-component system. 相似文献
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Phase equilibria and thermodynamic data of the Al-Re system are critically reviewed. In addition to the three solution phases,
liquid, fcc Al, and hcp Re, there exist six intermetallic compounds in this binary. The thermodynamic properties of the system
are analyzed using thermodynamic models for the Gibbs energy of individual phases of the system. A regular solution model
is used for the three substitutional solution phases, and the intermetallic phases are treated as stoichiometric compounds.
The model parameters are optimized from a limited amount of experimental data. The calculated phase diagram and thermodynamic
values are in accord with the available experimental values. 相似文献
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Thermodynamic Treatment of Undercooled Cu-Mg Liquid and the Limits for Partitionless Crystallization
The thermodynamic properties of the binary Cu-Mg system are examined with a focus on equilibria involving the liquid phase,
which is described with a four-species association model, incorporating a two-state treatment for the pure component liquids
below their respective melting temperatures. The terminal and intermediate crystalline phases are described as substitutional
solid solutions, employing two sublattices for the latter. Model parameters are fitted using available experimental data,
and the resulting phase diagram is reported over the full range of compositions in the binary system. We also report the associated
T
0 curves, indicating the limits of partitionless crystallization and compare these with reports of amorphous solid formation
during rapid solidification processing. 相似文献