Magnetic and mechanical properties of nanotwin SiO2-FeCoNi(AlSi)0.4 high entropy alloy prepared by mechanical alloying and spark plasma sintering

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2024-10-15 DOI:10.1016/j.jmmm.2024.172596

Rui Wang , Qiqi Chen , Xini Xiong , Mengmeng Meng , Shaofeng Yang

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Abstract

High-entropy alloys (HEAs), comprised of ferromagnetic metals such as Fe, Co, and Ni, demonstrate remarkable combinations of magnetic and mechanical properties. In this study, we explored the microstructure and magnetic characteristics of SiO₂-FeCoNi(AlSi)_0.4 core–shell HEAs fabricated via mechanical alloying (MA) and spark plasma sintering (SPS). Thermodynamic analysis revealed that the FeCoNi(AlSi)_0.4 core–shell alloy system exhibits a higher ΔS (11.75 kJ/mol), indicating that forming a solid solution structure is easy. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses confirmed the development of a face-centered cubic (FCC) solid solution with a highly deformed nanotwin structure after SPS as-sintered. The vibrating sample magnetometer (VSM) test indicated an elevated soft magnetic behavior for FeCoNi(AlSi)_0.4 core–shell HEAs as-sintered, with a magnetic saturation (MS) of 140.2 emu/g and a coercivity field (HC) of 1.35 Oe in an applied magnetic field of 2 T. The ultimate shear strength and tensile strengths were found to be 1552.4 MPa and 1278.9 MPa, respectively. This investigation conclusively highlights that the lower fault energy of the FeCoNi(AlSi)_0.4 alloy system significantly influences the mechanical and magnetic properties of HEAs.

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通过机械合金化和火花等离子烧结制备的纳米孪晶 SiO2-FeCoNi(AlSi)0.4 高熵合金的磁性和力学性能

由铁、钴和镍等铁磁性金属组成的高熵合金（HEAs）具有卓越的磁性和机械特性。在本研究中，我们探讨了通过机械合金化（MA）和火花等离子烧结（SPS）制造的 SiO2-FeCoNi(AlSi)0.4 核壳 HEA 的微观结构和磁特性。热力学分析表明，FeCoNi(AlSi)0.4 核壳合金体系具有较高的ΔS (11.75 kJ/mol)，表明很容易形成固溶体结构。X 射线衍射（XRD）和透射电子显微镜（TEM）分析证实，在 SPS 烧结后，面心立方（FCC）固溶体具有高度变形的纳米孪晶结构。振动样品磁力计（VSM）测试表明，烧结后的铁钴镍(铝硅)0.4 芯壳 HEA 具有较高的软磁特性，在 2 T 的外加磁场中，磁饱和度（MS）为 140.2 emu/g，矫顽力场（HC）为 1.35 Oe。这项研究最终表明，FeCoNi(AlSi)0.4 合金体系较低的断层能显著影响了 HEA 的机械和磁性能。

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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.