Abstract The structure and compositions of spinodal phases in Alnico8 alloy isothermally treated at 830 °C under external magnetic field (Hext) up to 10 T were investigated by transmission electron microscopy (TEM). Under ultra-high magnetic field (10 T), the spinodal structure of Alnico8 alloy presents interesting diversity for the shapes of α1 phase particles, namely, Π-shape, H-shape and Ш-shape apart from regular rod-shape. Composition analysis shows that the Fe was mainly distributed in the α1 phase. The Co content in the α1 phase was lower than that in the α2 phase as evidenced by the point analysis results, and Co content inα1 phase of the alloy treated without magnetic field was higher than that of the alloy treated with a magnetic field. In contrast, the Ni, Al, Cu and Ti were concentrated in the α2 phase. The average hyperfine field of the alloy treated without magnetic field was about 301.3 kOe. While the alloy treated under magnetic field, it was slightly decreased, which was about 292.0 and 296.1 kOe under 0.7 and 10 T, respectively. Magnetic properties of the alloy treated under a 10 T magnetic field were the best, which were about 1.09T, 396Oe and 9.5 kJ/m3 for Br, Hc and (BH)max respectively. Especially for the coercivity, which was mainly contributed by the anisotropy of the α1 phase induced by the high magnetic field.

中文翻译：

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10T磁场热磁化处理Alnico8合金的结构与磁性能

摘要 通过透射电子显微镜 (TEM) 研究了在高达 10 T 的外部磁场 (Hext) 下，在 830 °C 下等温处理的 Alnico8 合金的旋节相的结构和成分。在超高磁场（10 T）下，Alnico8合金的旋节线结构除了规则的棒状外，α1相粒子的形状呈现出有趣的多样性，即Π形、H形和Ш形。成分分析表明，Fe主要分布在α1相中。点分析结果表明，α1相中的Co含量低于α2相，无磁场处理的合金α1相中的Co含量高于磁场处理合金。相反，Ni、Al、Cu 和 Ti 集中在 α2 相中。无磁场处理的合金的平均超精细磁场约为 301.3 kOe。而在磁场下处理的合金则略有下降，分别在 0.7 和 10 T 下约为 292.0 和 296.1 kOe。在10 T磁场下处理的合金的磁性能最好，Br、Hc和(BH)max分别约为1.09T、396Oe和9.5 kJ/m3。尤其是矫顽力，主要由强磁场引起的α1相的各向异性贡献。Br、Hc 和 (BH)max 分别为 5 kJ/m3。特别是矫顽力，主要是由强磁场引起的α1相的各向异性贡献的。Br、Hc 和 (BH)max 分别为 5 kJ/m3。尤其是矫顽力，主要由强磁场引起的α1相的各向异性贡献。