Thermodynamic optimization of the boron–cobalt–iron system

Liu, Y.Q.; Zhao, Xiangshan; Yang, Jianhua; Shen, Jian

doi:10.1016/j.jallcom.2011.01.170

Cited by 19 publications

(8 citation statements)

References 24 publications

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“…Their results were in reasonable agreement with the experimental data provided by Van Loo et al [ 11 ] at 900 °C as shown in Figure 2 a. At 1000 °C, the experimental data provided by Liu et al [ 12 ] and Rogl et al [ 9 ] contradicted those reported by of Pradelli et al [ 10 ], as can be seen from Figure 2 b.…”

Section: Literature Reviewsupporting

confidence: 90%

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Phase Equilibria and Magnetic Phases in the Ce-Fe-Co-B System

2016

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Ce-Fe-Co-B is a promising system for permanent magnets. A high-throughput screening method combining diffusion couples, key alloys, Scanning Electron Microscope/Wavelength Dispersive X-ray Spectroscope (SEM/WDS), and Magnetic Force Microscope (MFM) is used in this research to understand the phase equilibria and to explore promising magnetic phases in this system. Three magnetic phases were detected and their homogeneity ranges were determined at 900 °C, which were presented by the formulae: Ce2Fe14−xCoxB (0 ≤ x ≤ 4.76), CeCo4−xFexB (0 ≤ x ≤ 3.18), and Ce3Co11−x FexB4 (0 ≤ x ≤ 6.66). The phase relations among the magnetic phases in this system have been studied. Ce2(Fe, Co)14B appears to have stronger magnetization than Ce(Co, Fe)4B and Ce3(Co, Fe)11B4 from MFM analysis when comparing the magnetic interactions of selected key alloys. Also, a non-magnetic CeCo12−xFexB6 (0 ≤ x ≤ 8.74) phase was detected in this system. A boron-rich solid solution with Ce13FexCoyB45 (32 ≤ x ≤ 39, 3 ≤ y ≤ 10) chemical composition was also observed. However, the crystal structure of this phase could not be found in the literature. Moreover, ternary solid solutions ε1 (Ce2Fe17−xCox (0 ≤ x ≤ 12.35)) and ε2 (Ce2Co17−xFex (0 ≤ x ≤ 3.57)) were found to form between Ce2Fe17 and Ce2Co17 in the Ce-Fe-Co ternary system at 900 °C.

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Section: Literature Reviewsupporting

confidence: 90%

“…The early experimental studies of the Co-Fe-B ternary system can be found in [ 9 , 10 , 11 ]. Liu et al [ 12 ] calculated isothermal sections of this system at 900 °C and 1000 °C. Their results were in reasonable agreement with the experimental data provided by Van Loo et al [ 11 ] at 900 °C as shown in Figure 2 a.…”

Section: Literature Reviewmentioning

confidence: 99%

Phase Equilibria and Magnetic Phases in the Ce-Fe-Co-B System

2016

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“…Also the uniform distribution of cobalt supports that Co has made a solid solution with iron in boride by replacing iron in the boride lattice. A study made by Liu also shows that Co can be dissolved in FeB and FeB 2 in all compositions [16]. The decrease in coating thickness and coarsening of boride crystals in the boride layer can be attributed to a slight hindrance of boron atoms due to presence of cobalt atoms in iron substrate.…”

Section: Discussionmentioning

confidence: 82%

A Comparative Study on Boride Layer Morphology of Fe-4Co, Fe-4V and Fe-4W Binary Alloys

2015

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In this study, the pack boronizing behavior of Fe-4M alloys (at.% M=W, V, Co) along with pure iron was investigated. The boronizing process was carried out at 1100• C for 3 h. The morphology, microstructure, boride layer thickness and surface properties of the formed boride layers were characterized by XRD, SEM-EDS and prolometry. The average boride layer thicknesses were 85 µm, 130 µm, 275 µm and 280 µm for Fe-4W, Fe-4V, Fe-4Co binary alloys and pure Fe, respectively. The surface roughness was not changed with the addition of alloying element into the substrate. FeB and Fe2B phases exist on all boronized samples, but their ratio changes owing to alloying elements in the substrate. The saw-tooth morphology has transformed to a smoother boride layer with the addition of alloying elements of W and V, though Co addition was ineective on saw tooth morphology. In addition, a transition zone under the boride layer was observed for the boronized Fe-W and Fe-V alloys. The formation of precipitates of boride of alloying elements was evident in the boride layer and in the transition zone for borided Fe-4V and Fe-4W alloys. Co has made a solid solution with iron in boride by replacing iron in the boride lattice.

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“…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 ].…”

Section: Construction Of Database For Nd-based Magnetsmentioning

confidence: 99%

“…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…”

mentioning

confidence: 99%

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

Abe

Morishita

Chen

et al. 2021

Science and Technology of Advanced Materials

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Development of a prototype thermodynamic database for Nd-Fe-B permanent magnetsFor the Nd-Fe-B permanent magnets, a prototype thermodynamic database of the 8-element system (Nd, Fe, B, Al, Co, Cu, Dy, Ga) was constructed based on literature data and assessed parameters in the present work. The magnetic excess Gibbs energy of the Nd 2 Fe 14 B compound was reassessed using thoroughly measured heat capacity data. The Dy-Nd binary system was reassessed based on formation energies estimated from ab initio calculations. The constructed database was applied successfully for estimations of phase equilibria during the grain boundary diffusion processes (GBDP) and the reactions in the hydrogenation decomposition desorption recombination (HDDR) processes.

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Thermodynamic optimization of the boron–cobalt–iron system

Cited by 19 publications

References 24 publications

Phase Equilibria and Magnetic Phases in the Ce-Fe-Co-B System

Phase Equilibria and Magnetic Phases in the Ce-Fe-Co-B System

A Comparative Study on Boride Layer Morphology of Fe-4Co, Fe-4V and Fe-4W Binary Alloys

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

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