Experimental determination and thermodynamic assessment of the Dy-Fe-B system

IF 1.9 3区材料科学 Q4 CHEMISTRY, PHYSICAL Calphad-computer Coupling of Phase Diagrams and Thermochemistry Pub Date : 2025-06-01 Epub Date: 2025-03-24 DOI:10.1016/j.calphad.2025.102826

Wei Yang , Yiwei Wang , Shuhong Liu , Peisheng Wang , Wei Zhai

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Abstract

The phase equilibria of the Fe-Dy-B system on the Fe-Dy side are crucial for the development of Nd-Dy-Fe-B permanent magnets. Alloys located on the Fe-Dy side were prepared and annealed at 1073 K and 1173 K for 60 days. The annealed samples were analyzed by electron probe microanalysis (EPMA) and X-ray diffraction (XRD). In this work, three ternary compounds τ₁, τ₃, and τ₄ were identified on the Fe-Dy side at 1073 K and 1173 K. The previously reported τ₂ phase was not observed in the present work. Nine three-phase regions were determined in the present study and the isothermal sections of the Dy-Fe-B system on the Dy-Fe side at 1073 K and 1173 K were constructed. Based on the experimental data, thermodynamic modeling of the system was performed using the CALculation of PHAse Diagrams (CALPHAD) method. The calculated results show good agreement with the experimental data.

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Dy-Fe-B体系的实验测定及热力学评价

Fe-Dy- b系在Fe-Dy侧的相平衡对Nd-Dy-Fe-B永磁体的发展至关重要。制备了Fe-Dy侧的合金，分别在1073 K和1173 K下退火60天。采用电子探针显微分析（EPMA）和x射线衍射（XRD）对退火后的样品进行了分析。在1073 K和1173 K的Fe-Dy一侧鉴定了三个三元化合物τ1、τ3和τ4。先前报道的τ2相在本研究中未被观察到。本研究确定了9个三相区，并在1073 K和1173 K下构建了Dy-Fe- b系在Dy-Fe侧的等温截面。基于实验数据，采用相图计算（CALPHAD）方法对系统进行了热力学建模。计算结果与实验数据吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Calphad-computer Coupling of Phase Diagrams and Thermochemistry 化学-热力学

CiteScore

4.00

自引率

16.70%

发文量

审稿时长

2.5 months

期刊介绍： The design of industrial processes requires reliable thermodynamic data. CALPHAD (Computer Coupling of Phase Diagrams and Thermochemistry) aims to promote computational thermodynamics through development of models to represent thermodynamic properties for various phases which permit prediction of properties of multicomponent systems from those of binary and ternary subsystems, critical assessment of data and their incorporation into self-consistent databases, development of software to optimize and derive thermodynamic parameters and the development and use of databanks for calculations to improve understanding of various industrial and technological processes. This work is disseminated through the CALPHAD journal and its annual conference.