Structural and magnetic behavior of milled EUROFER with Nb2O5 additions

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-08-18 DOI:10.1016/j.jmmm.2025.173445

Roberta Araujo Cavalcante de Menezes , Diêgo Pires Gurgel , Isaac Barros Tavares da Silva , Ingryd Kely Cosme Melo , Maria José Santos Lima , Marcello Filgueira , Marco Antonio Morales Torres , José Humberto Araujo , Uilame Umbelino Gomes

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引用次数: 0

Abstract

EUROFER is a ferritic-martensitic steel with reduced activation, it is being used in the construction of nuclear fusion reactors due to its robust mechanical performance when exposed to radiation, neutron and helium bombardment. However, its operational temperature is limited to 500 °C, caused by microstructural changes at higher temperatures. This study investigates the structural and magnetic behavior of EUROFER alloy with the addition of niobium pentoxide (Nb₂O₅) after 15 h high-energy milling. The aim of this work is to study the microstructure, crystallite size, lattice parameters, and magnetic properties of the composite, using X-ray diffraction, magnetometry and Mössbauer spectroscopy. The results revealed significant reduction in crystallite size and alterations in magnetic properties, including decreased saturation magnetization and increased coercivity, while Mössbauer spectroscopy confirms no oxidation of EUROFER during the milling process and suggests Nb incorporation into the alloy. These findings suggested that the presence of Nb₂O₅ during the milling process promoted the formation of a new solid solution, making the alloy less susceptible to magnetic fields, an essential characteristic for applications involving exposure to high magnetic fields.

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添加Nb2O5后EUROFER的结构和磁性行为

EUROFER是一种活化度较低的铁素体-马氏体钢，由于其在辐射、中子和氦轰击下具有强大的机械性能，因此被用于核聚变反应堆的建造。然而，它的工作温度被限制在500°C，这是由于高温下微观结构的变化造成的。研究了添加五氧化二铌（Nb2O5）的EUROFER合金经过15 h高能铣削后的结构和磁性行为。本研究的目的是利用x射线衍射、磁强计和Mössbauer光谱学研究复合材料的微观结构、晶粒尺寸、晶格参数和磁性能。结果显示，晶粒尺寸明显减小，磁性能发生变化，包括饱和磁化强度降低和矫顽力增加，而Mössbauer光谱证实，在铣削过程中，EUROFER没有氧化，表明Nb掺入了合金中。这些发现表明，在铣削过程中Nb2O5的存在促进了新的固溶体的形成，使合金对磁场的敏感性降低，这是涉及高磁场应用的基本特性。

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

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.