Mixing enthalpies of liquid alloys and thermodynamic assessment of the Cu–Fe–Co system

Abstract

The mixing enthalpies of ternary Cu-Fe-Co liquid alloys are studied by the calorimetric method at 1873 K and x Co = 0-0.55. Thermodynamic assessments of the Fe-Co and Cu-Fe-Co systems are carried out with the CALPHAD method. A set of self-consistent thermodynamic parameters of the phases is obtained using data on the mixing enthalpies established in this study and published information on phase transformations. Isothermal and vertical sections of the phase diagram, liquidus and solidus surfaces, and metastable miscibility gap for overcooled liquid alloys are calculated. The undercooling degrees for the metastable liquid phase separation and temperaturecomposition ranges of the formation of the supersaturated solid solutions during the liquid quenching have been assessed.

Thermodynamic properties of dilute Co-Fe solid solutions studied by 57Fe Mössbauer spectroscopy

“…The findings are presented in Fig. 6 together with the results of calculations using CALPHAD [6]; the corresponding values obtained [7]; and the values resulting from Miedema's model [27].…”

“…In particular, these alloys are used in the production of turbine engine components, transformers, magnetic bearings and recording heads [1][2][3][4][5]. At the same time, this system is regarded as a model for experimental and theoretical studies of thermodynamic properties [6][7][8].…”

Development of a prototype thermodynamic database for Nd-Fe-B permanent magnets

“…This database includes 6 ternary systems taken from the literature, which are B-Fe-Nd [ 56 ], B-Co-Fe [ 76 ], Al-Cu-Dy [ 77 ], Al-Cu-Fe [ 78 ], Co-Cu-Fe [ 79 ], and Cu-Fe-Nd [ 80 ] ternaries. The Gibbs energy of the phases in these binary and some ternary systems can be downloaded from our database, Computational Phase Diagram Database (CPDDB) [ 81 ].…”

“…Thermodynamic descriptions for the 25 assessed binary systems adopted in the present work are: Al-B [44], Al-Co [45], Al-Cu [46], Al-Dy [47], Al-Fe [48], Al-Ga [49], Al-Nd [50], B-Co [51], B-Cu [52], B-Dy [53], B-Fe [54], B-Ga [55], B-Nd [56], Co-Cu [57], Co-Dy [58], Co-Fe [59], Co-Ga [60], Co-Nd [61],Cu-Dy[62], Cu-Fe[63], Cu-Ga[64], Cu-Nd[65], Dy-Fe[66], Fe-Ga[67], and Fe-Nd[56]. The Dy-Ga[68][69][70][71] and Ga-Nd[56], B-Co-Fe[76], Al-Cu-Dy[77], Al-Cu-Fe[78], Co-Cu-Fe[79], and Cu-Fe-Nd…”

Thermodynamic Descriptions of the Co–Zr and Co–Fe–Zr Systems

“…Guillermet, [15] Ohnuma et al [16] and Turchanin et al [17] carried out the thermodynamic studies of the Co-Fe system, but their calculated magnetic properties did not completely reproduce the experimental data. [18][19][20] Wang et al [12] conducted the first-principles calculations and heat capacity measurements and performed a detailed thermodynamic assessment of the Co-Fe system.…”