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Experimental Study and Thermodynamic Calculation of Phase Equilibria in the La-Fe-B Ternary System
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AI
M
孙
K
Q
J
G
H
DOI：10.1007/s11669-025-01219-x.png)
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Abstract
En 中文
The phase equilibria of La-Fe-B alloys at 873 K were studied by means of the equilibrated alloy method using scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) and x-ray diffraction (XRD). It was confirmed that the ternary intermetallic compound La2Fe14B (tau 1) with the Nd2Fe14B-type structure and space group P42/mnm is not stable at 873 K, while the ternary intermetallic compound La1.1Fe4B4 (tau 2) with the Ndl+epsilon Fe4B4-type structure and space group Pccn exists. The isothermal section of the La-Fe-B ternary system at 873 K was determined. Based on the experimental results determined in this work and reported in the literature, thermodynamic calculation of the La-Fe-B ternary system was conducted using the CALPHAD method in combination with the previous assessments of the La-Fe, Fe-B and La-B binary systems. The calculated results including isothermal sections, vertical sections and liquids projection are in good agreement with the experimental results. A set of self-consistent thermodynamic parameters of the La-Fe-B ternary system was finally obtained, which is a good basis of the devolvement of a thermodynamic database of Nd-La-Fe-B alloys to explore Nd-Fe-B permanent magnets with high-performance and low-cost.
Keywords:
CALPHAD
intermetallic compound
La-Fe-B
phase equilibria
phase structure
Journal
J
IF:
1.7
Papers:
35
Citations:
3.5K
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Cited Papers