钆-锰-镓(≤50%钆)三元体系在 873K 时的相图等温段

IF 1.9 3区 材料科学 Q4 CHEMISTRY, PHYSICAL Calphad-computer Coupling of Phase Diagrams and Thermochemistry Pub Date : 2024-03-13 DOI:10.1016/j.calphad.2024.102668
Qian Wang , Wei He , Tonghan Yang , Yifei Bi , Yunxiang Yang , Chongjiang Li , Changzhong Liao
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引用次数: 0

摘要

Gd-Mn-Ga三元体系相图是探索和开发具有磁性、半金属性、铁磁形状记忆效应、磁致效应等优异物理性能的稀土Heusler合金的重要工具。本研究使用真空电弧熔炼炉制备了合金样品,并通过 X 射线衍射(XRD)、扫描电子显微镜(SEM)和能谱分析(EDS)测定了钆锰镓(≤50 at.%Ga)三元合金相图的 873 K 等温段。等温段由 22 个单相区、44 个两相区和 23 个三相区组成,存在 6 种三元化合物:GdMnGa、Gd2MnGa6、Gd2Mn15Ga2、Gd2Mn11Ga6、GdMn0.56Ga1.44 和 GdMn0.37Ga1.63。Ga 在 β-Mn 和 Gd2Mn15Ga2 中的固溶度范围分别为 5.0-18.1 at.%Ga 和 10.5-25.0 at.%Ga。α-锰、GdMn12 和 Gd6Mn23 中 Ga 的最大固溶度分别为 2.0、2.7 和 7.3 at.%。锰在 GdGa2 中的最大固体溶解度为 13.1%。
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The isothermal section of the phase diagram of Gd-Mn-Ga (≤50 at.%Ga) ternary system at 873K

The phase diagram of the Gd-Mn-Ga ternary system is a very important tool for the exploration and development of rare earth Heusler alloys with excellent physical properties, such as magnetic properties, half-metallic properties, ferromagnetic shape memory effect, magnetocaloric effect, ect. In this study, the alloy samples were prepared using a vacuum arc melting furnace, and the 873 K isothermal section of the Gd-Mn-Ga (≤50 at.%Ga) ternary alloy phase diagram was determined by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy spectrometry (EDS). The isothermal section consists of 22 single-phase regions, 44 two-phase regions, and 23 three-phase regions with the presence of 6 ternary compounds, GdMnGa, Gd2MnGa6, Gd2Mn15Ga2, Gd2Mn11Ga6, GdMn0.56Ga1.44, and GdMn0.37Ga1.63. The solid solubility ranges of Ga in β-Mn and Gd2Mn15Ga2 are 5.0–18.1 at.%Ga and 10.5–25.0 at.% Ga. The maximum solid solubility of Ga in α-Mn, GdMn12, and Gd6Mn23 are 2.0, 2.7, and 7.3 at.% Ga, respectively. The maximum solid solubility of Mn in GdGa2 is determined to be 13.1 at.% Mn.

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来源期刊
CiteScore
4.00
自引率
16.70%
发文量
94
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.
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