Experimental investigation on phase equilibria of the Nd-Y and Nd-Y-Fe systems

IF 1.9 3区材料科学 Q4 CHEMISTRY, PHYSICAL

Calphad-computer Coupling of Phase Diagrams and Thermochemistry Pub Date : 2024-12-12 DOI:10.1016/j.calphad.2024.102788

Chengliang Qiu , Shuhong Liu , Wei Yang , Wei Zhai , Yong Du

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Abstract

Phase equilibria of the Nd-Y system at 400, 600 and 800 °C and the Nd-Y-Fe system at 400 and 600 °C were investigated by X-ray diffraction (XRD) and electron probe microanalysis (EPMA). Based on the experimental results in this work and literature, phase diagram of the Nd-Y system was refined and isothermal sections of the Nd-Y-Fe system at 400 and 600 °C were constructed. In the Nd-Y system, the solid solubility range of δ(Nd₂Y) was approximately 28.66–36.85 at.% Y at 400 °C and a two-phase region (αNd)+(αY) was observed from 34.73 to 36.52 at.% Y at 800 °C. In the Nd-Y-Fe system, eight and six three-phase regions at 400 and 600 °C were determined, respectively. Two phases of Nd₂Fe₁₇ and Y₂Fe₁₇ link up with each other from the Nd-Fe side to the Y-Fe side across the isothermal sections at both 400 and 600 °C. The maximal solubilities of Nd in the Y₆Fe₂₃, YFe₃ and YFe₂ were about 13.13, 7.06 and 6.14 at.% at both 400 and 600 °C, respectively. There was also noticeable solubility of Y in Nd₅Fe₁₇ and Fe in (αNd) and δ(Nd₂Y) at 400 and 600 °C. In addition, three newly observed ternary compounds τ₁, τ₂ and τ₃ were determined with compositions of approximately 16.50 at.% Nd-16.50 at.% Y-67.00 at.% Fe, 15.00 at.% Nd-20.00 at.% Y-65.00 at.% Fe and 20.00 at.% Nd-15.00 at.% Y-65.00 at.% Fe, respectively.

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钕-钇和钕-钇-铁体系相平衡的实验研究

利用x射线衍射（XRD）和电子探针微量分析（EPMA）研究了Nd-Y体系在400、600和800℃的相平衡以及Nd-Y- fe体系在400和600℃的相平衡。根据本文的实验结果和文献资料，对Nd-Y体系的相图进行了细化，并构建了Nd-Y- fe体系在400℃和600℃的等温截面。在Nd-Y体系中，δ(Nd2Y)的固溶范围约为28.66 ~ 36.85 at。在400℃时，在34.73 ~ 36.52℃时，观察到αNd + αY两相区。% Y在800°C。在Nd-Y-Fe体系中，在400°C和600°C分别确定了8个和6个三相区。在400°C和600°C的等温截面上，Nd2Fe17和Y2Fe17两相从Nd-Fe侧到Y-Fe侧相互连接。Nd在Y6Fe23、YFe3和YFe2中的最大溶解度分别为13.13、7.06和6.14 at。%，分别在400°C和600°C。在400℃和600℃时，Y在Nd5Fe17中的溶解度明显，Fe在（αNd）和δ(Nd2Y)中的溶解度明显。此外，测定了三个新观察到的三元化合物τ1、τ2和τ3，其组成约为16.50 at。% Nd-16.50。% -67.00 at。下午15点。% Nd-20.00。% Y-65.00 at。% Fe和20.00 at。-15.00美元。% Y-65.00 at。分别为% Fe。

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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.