High temperature phase relations and structure determination of solid solutions in the ternary Nd-Dy-Cu system

IF 1.9 3区材料科学 Q4 CHEMISTRY, PHYSICAL

Calphad-computer Coupling of Phase Diagrams and Thermochemistry Pub Date : 2024-11-16 DOI:10.1016/j.calphad.2024.102770

Srečo D. Škapin , Amalija Golobič , Edith De Leon , Catalina O. Tudor , Matjaž Spreitzer , Danilo Suvorov , Miha Zakotnik

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Abstract

The sub-solidus phase relations in the ternary Nd-Dy-Cu system were determined for an isothermal section at 550 °C. The samples were prepared by arc-melting and subsequent annealing in a protective atmosphere for 120 h. The phases in the prepared samples were characterized by X-ray powder diffraction and scanning electron microscopy, and their composition was determined by energy-dispersive spectroscopy. The intermetallic compounds based on the Dy-Cu system are compatible with compounds based on Nd-Cu-based and exhibit a high degree of solid-state solubility. The crystal structures of the solid solutions and their transformations were determined in detail. In the Cu-rich part of the system, the compound DyCu₇, which is stable above 700 °C according to literature data, was confirmed under the applied experimental conditions and is connected to NdCu₆ by a tie line.

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三元钕-镝-铜体系固溶体的高温相关系和结构测定

在 550 °C 等温段测定了三元钕-镝-铜体系的亚固相关系。通过 X 射线粉末衍射和扫描电子显微镜对制备的样品中的相进行了表征，并通过能量色散光谱测定了它们的成分。基于 Dy-Cu 体系的金属间化合物与基于 Nd-Cu 体系的化合物兼容，并表现出较高的固态溶解度。研究人员详细测定了固溶体的晶体结构及其转变。在该体系的富铜部分，化合物 DyCu7 在应用的实验条件下得到了证实，根据文献数据，该化合物在 700 °C 以上是稳定的，并通过一条连接线与 NdCu6 相连。

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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.