Based on the highly efficient diffusion couple and equilibrated alloy methods, phase relations in La-Fe-B ternary system were experimentally investigated by scanning electron microscopy, electron probe microanalysis and electron backscatter diffraction techniques. Isothermal sections of the La-Fe-B system at both 600 and 800 °C were constructed. One ternary phase (LaFe4B4-τ2) was detected at 600 °C and two ternary compounds (τ2 and La2Fe14B-τ1) were determined at 800 °C. Seven three-phase zones were found at 600 °C and ten three-phase regions were found at 800 °C. Liquid phase was found in the La-rich corner at 800 °C. The solid solubility of both binary and ternary compounds in the system is negligible. The present experimental results are important for the design of multi-main-phase Nd-La-Ce-Fe-B magnets.
This is a preview of subscription content, log in to check access.
Buy single article
Instant unlimited access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
J.Y. Jin, M. Yan, Y.S. Liu, B.X. Peng, and G.H. Bai, Attaining High Magnetic Performance in As-Sintered Multi-Main-Phase Nd-La-Ce-Fe-B Magnets: Toward Skipping the Post-Sinter Annealing Treatment, Acta Mater., 2019, 169, p 248-259
X.D. Fan, G.F. Ding, K. Chen, S. Guo, C.Y. You, R.J. Chen, D. Lee, and A. Yan, Whole Process Metallurgical Behavior of the High-Abundance Rare-Earth Elements LRE (La, Ce and Y) and the Magnetic Performance of Nd0.75LRE0.25-Fe-B Sintered Magnets, Acta Mater., 2018, 154, p 343-354
K.S. Xu, H.W. Li, Y. Luo, L.G. Wang, D.B. Yu, Z.L. Wang, H.J. Peng, and Y.H. Zhang, Experimental and Computational Study on the Phase Formation and Magnetic Properties of Ce-La-Fe-B Alloys, J. Magn. Magn. Mater., 2018, 461, p 100-105
G.C. Hadjipanayis, Y.F. Tao, and K. Gudimetta, Formation of Fe14La2B Phase in As-Cast and Melt-Spun Samples, Appl. Phys. Lett., 1985, 47, p 757-758
G.J. Zhou, Y. Luo, and Y. Zhou, Thermodynamic Reassessment of the Nd-Fe-B Ternary System, J. Electron. Mater., 2016, 45, p 418-425
X. Tang, H. Sepehri-Amin, T. Ohkubo, M. Yano, M. Ito, A. Kato, N. Sakuma, T. Shoji, T. Schrefl, and K. Hono, Coercivity Enhancement of Hot-Deformed Ce-Fe-B Magnets by Grain Boundary Infiltration of Nd-Cu Eutectic Alloy, Acta Mater., 2018, 144, p 884-895
J.F. Herbst, R2Fe14 B Materials: Intrinsic Properties and Technological Aspects, Rev. Mod. Phys., 1991, 63, p 819-898
J.Y. Jin, Z. Wang, G.H. Bai, B.X. Peng, Y.S. Liu, and M. Yan, Microstructure and Magnetic Properties of Core-Shell Nd-La-Fe-B Sintered Magnets, J. Alloys Compd., 2018, 749, p 580-585
J.Y. Jin, G.H. Bai, Z.H. Zhang, and M. Yan, Coercivity Enhancement for Nd-La-Ce-Fe-B Sintered Magnets by Tailoring La and Ce Distributions, J. Alloys Compd., 2018, 763, p 854-860
B. Hallemans, P. Wollants, and J.R. Roos, Thermodynamic Assessment of the Fe-Nd-B Phase Diagram, J. Phase Equilib., 1995, 16, p 139-149
L. Kaufman, B. Uhrenius, D. Birnie, and K. Taylor, Coupled Pair Potential, Thermochemical and Phase Diagram Data for Transition Metal Binary Systems-VII, Calphad, 1984, 8, p 25-66
T. Van Rompaey, K.C.H. Kumar, and P. Wollants, Thermodynamic Optimization of the B-Fe System, J. Alloys Compd., 2002, 334, p 173-181
K. Yoshitomi, Y. Nakama, H. Ohtani, and M. Hasebe, Thermodynamic Analysis of the Fe-Nb-B Ternary System, ISIJ Int., 2008, 48, p 835-844
M.V. Ende and I. Jung, Critical Thermodynamic Evaluation and Optimization of the Fe-B, Fe-Nd, B-Nd and Nd-Fe-B Systems, J. Alloys Compd., 2013, 548, p 133-154
M.E. Schlesinger, P.K. Liao, and K.E. Spear, The B-La (Boron–Lanthanum) System, J. Phase Equilib., 1999, 20, p 73-78
P.N. Zhuravlev, R.M. Manelis, I.A. Belousova, and VKh Nurmukhamedov, Investigation of Lanthanum Hexaboride Subjected to High-Temperature Compacting at High Pressures, Izv. Akad. Nauk. SSSR Neorg. Mater., 1973, 9, p 1162-1165
R.W. Johnson and A.H. Daane, The Lanthanum–Boron System, J. Phys. Chem., 1961, 65, p 909-915
M.J. McKelvy, L. Eyring, and E.K. Storms, Analytical and Structural Analysis of the Lanthanum-Deficient Lanthanum Hexaboride, J. Phys. Chem., 1984, 88, p 1785-1791
Y. Tang, B. Hu, J. Wang, Q.N. Gao, Y. Du, X.M. Yuan, and D. Zivkovic, Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus., 2013, 34, p 297-306
B. Konar, J. Kim, and I.H. Jung, Critical Systematic Evaluation and Thermodynamic Optimization of the Fe-RE System: RE = La, Ce, Pr, Nd and Sm, J. Phase Equilib. Diffus., 2016, 37, p 438-458
J. Richerd, Lanthanum and Cerium in Pure Iron, Mem. Sci. Rev. Metall., 1962, 59, p 539-548
M. Mardani, I. Fartushna, A. Khvan, V. Cheverikin, and A. Dinsdale, Experimental Investigation of Phase Transformations in the La-Fe and La-Fe-C Systems, Calphad, 2019, 65, p 370-384
K. Oesterrericher and H. Oesterrericher, Nowotny Chimney Ladder Compounds in Nd1+EFe4−xCoxB4, J. Solid State Chem., 1987, 70, p 313-317
M. Rosenberg, T. Sinnernann, M. Mittag, and K.H.J. Buschow, Magnetic Properties and 57Fe Mössbauer Spectroscopy Rare Earth Compounds of the Type RFe12−xCoxB6, J. Alloys Compd., 1992, 182, p 145-156
Y.B. Kuz’ma, N.S. Bilonizhko, S.I. Svarichevskaya Edited by E.M. Savitskii, Phase diagrams of ternary systems containing rare earth metals and boron and the crystal structures of ternary borides, Redkozemel. Metal., Splavy Soedin., Mater. Soveshch. 7th (1973), 146–147.
Z.Y. Zhang, L.Z. Zhao, J.S. Zhang, X.C. Zhong, W.Q. Qiu, D.L. Jiao, and Z.W. Liu, Phase Precipitation Behavior of Rapidly Quenched Ternary La-Fe-B Alloy and the Effects of Nd Substitution, Mater. Res. Express, 2017, 4, p 1-7
L.L. Zhu, H.Y. Qi, L. Jiang, Z.P. Jin, and J.-C. Zhao, Experimental Determination of the Ni-Cr-Ru Phase Diagram and Thermodynamic Reassessments of the Cr-Ru and Ni-Cr-Ru Systems, Intermetallics, 2015, 64, p 86-95
J.C. Zhao, M.R. Jackson, and L.A. Peluso, Determination of the Nb-Cr-Si Phase Diagram Using Diffusion Multiples, Acta Mater., 2003, 51, p 6395-6405
H.H. Xu, X. Xiong, Y. Du, P.W. Wang, B. Hu, and Y.H. He, Phase Equilibria of the Co-Ta-Ti System at 950 °C, J. Alloys Compd., 2009, 485, p 249-254
Z.K. Liu, First-Principles Calculations and CALPHAD Modeling of Thermodynamics, J. Phase Equilib. Diffus., 2009, 30, p 517-534
H. Zhang, S.L. Shang, J.E. Saal, A. Saengdeejing, Y. Wang, L.Q. Chen, and Z.K. Liu, Enthalpies of Formation of Magnesium Compounds from First-Principles Calculations, Intermetallics, 2009, 17, p 878-885
J. Etourneau, J. Mercurio, R. Naslain, and P. Hagenmuller, Structure Electronique de Quelques Hexaborures de Type CaB6, J. Solid State Chem., 1970, 2, p 332-342
K. Kato, I. Kawada, C. Oshima, and S. Kawai, Lanthanum Tetraboride, Acta Cryst., 1974, 30, p 2933-2934
V.A. Barinov, V.A. Tsurin, S.I. Novikov, I.R. Shein, and V.T. Surikov, Short-Range Atomic Order in Fe2B Powders, Phys. Met. Metallogr., 2007, 103, p 470-480
The financial support from the the National Key Research and Development Program of China (2016YFB0700901), the National Natural Science Foundation of China (51761008, 51961001, 51871066 and 51761007), the Guangxi Natural Science Foundation (2018JJA160250, 2018GXNSFAA294069, 2016GXNSFGA38001), the Guangxi Project of Science and Technology (2017AD23031, 2018AD19088, AD19110078), the Scientific Research Foundation of Guilin University of Electronic Technology (UF18016) and Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials (2019GXYSOF08), and the innovation program of Guilin University of Electronic Technology for students (C99CLM00CL35) and Guangxi Key Laboratory of Information Materials (191012-Z, 171005-Z) are acknowledged. The authors thank the support from the foundation for Guangxi Bagui scholars.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
About this article
Cite this article
Wei, Q., Lu, Z., Wang, J. et al. Experimental Investigation of Phase Equilibria in the La-Fe-B System at 600 and 800 °C. J. Phase Equilib. Diffus. (2020). https://doi.org/10.1007/s11669-020-00777-6
- diffusion couple
- isothermal section
- La-Fe-B system
- phase equilibria