胡此立,鄢邵文,任玉平,等.新型FeCoNiAlTi软磁高熵合金显微组织与性能研究[J].精密成形工程,2025,17(5):86-94.
HU Cili,YAN Shaowen,REN Yuping,et al.Microstructure and Properties of a Novel FeCoNiAlTi Soft Magnetic High-entropy Alloy[J].Journal of Netshape Forming Engineering,2025,17(5):86-94. |
| 新型FeCoNiAlTi软磁高熵合金显微组织与性能研究 |
| Microstructure and Properties of a Novel FeCoNiAlTi Soft Magnetic High-entropy Alloy |
| 投稿时间：2024-11-27 |
| DOI：10.3969/j.issn.1674-6457.2025.05.010 |
| 中文关键词: 高熵合金 软磁 矫顽力 析出 L12相 |
| 英文关键词: high-entropy alloys soft magnetism coercivity precipitation L12 phase |
| 基金项目:国家自然科学基金青年基金(52101129);中央高校基本科研业务费(DUT23RC(3)062) |
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| 中文摘要: |
| 目的 研究Fe30Co30Ni30Al5Ti5高熵合金铸态样品和退火态样品的微观组织，分析组织结构与矫顽力之间的关系。方法 采用金相显微镜、X射线衍射仪、透射电子显微镜(TEM)及其集成的X射线能谱仪(EDS)对铸态合金和退火态合金的微观组织进行表征，采用综合物性测量仪(PPMS)和塞贝克系数电阻测量仪对合金的磁性能和电阻率进行测量。结果 退火态的Fe30Co30Ni30Al5Ti5高熵合金具有优异的软磁性能:矫顽力为14.3 A/m;饱和磁化强度为825.0 kA/m;电阻率为52.1 μΩ.cm。Fe30Co30Ni30Al5Ti5具有简单的面心立方结构(Face-Centered Cubic，FCC)结构，退火过程中形成的粗晶组织(晶粒尺寸>500 µm)有效降低了晶界对磁畴壁的钉扎作用，同时析出了高密度纳米尺度的L12相(相尺寸≈36.5 nm)，L12相中富集的Ti、Ni元素可以大幅度减小合金的内应力波长，L12与基体的共格相界也减小了对磁畴壁运动的阻碍，使退火态合金具有极低的矫顽力。结论 在退火热处理工艺下，Fe30Co30Ni30Al5Ti5高熵合金通过形成粗晶组织和析出高密度的共格纳米析出相大幅度降低了合金的矫顽力。 |
| 英文摘要: |
| The work aims to investigate the microstructure of as-cast and as-annealed samples of Fe30Co30Ni30Al5Ti5 high-entropy alloy to analyze the relationship between microstructure and coercivity. The microstructures of both as-cast and as-annealed alloys were characterized with optical microscopy (OM), X-ray diffraction, transmission electron microscopy (TEM) integrated with energy dispersive spectrometer (EDS). The magnetic properties and electrical resistivity of the alloys were measured with a physical property measurement system (PPMS) and seebeck coefficient-resistivity measurement instrument. The annealed alloy exhibited exceptional soft magnetic properties, including a coercivity of 14.3 A/m, a magnetization of 825.0 kA/m, and an electrical resistivity of 52.1 μΩ.cm. The microstructural analysis revealed a predominantly face-centered cubic (FCC) structure, with a coarse-grained microstructure (grain size>500 µm) resulting from the annealing process. This coarse structure reduced the pinning of magnetic domain walls by grain boundaries. Additionally, the high-density nanoscale L12 phase (≈36.5 nm) enriched with Ti and Ni elements could greatly reduce the internal stress wavelength of the alloy and the coherent phase boundary between the L12 and the matrix also reduced the obstruction of the movement of the magnetic domain wall, resulting in exceptionally low coercivity. In conclusion, under annealing heat treatment, Fe30Co30Ni30Al5Ti5 high-entropy alloy can significantly reduce its coercivity by forming a coarse-grained microstructure and precipitating high-density coherent nanoscale precipitates. |
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