Rui Wang , Qiqi Chen , Xini Xiong , Mengmeng Meng , Shaofeng Yang
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引用次数: 0
摘要
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。
Magnetic and mechanical properties of nanotwin SiO2-FeCoNi(AlSi)0.4 high entropy alloy prepared by mechanical alloying and spark plasma sintering
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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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.
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