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学者姓名：张东涛
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Abstract ：
2∶17型Sm(CoFeCuZr)_z烧结永磁体因其良好的磁性能和优异的温度稳定性，在航空航天、5G通讯、新能源技术等领域被广泛应用。Sm(CoFeCuZr)_z烧结永磁体的常规制备工艺为粉末冶金法，历经几十年的发展，国内外研究者针对Sm(CoFeCuZr)_z烧结磁体的制备工艺开展了大量的研究。特别是近年来，包括速凝、氢碎、气流磨、第二相掺杂等新工艺被逐步研究并应用于磁体的制备，磁体的综合性能实现了显著的优化。本文以2∶17型Sm(CoFeCuZr)_z烧结永磁体制备流程为主线，梳理了磁体在铸态合金、制粉工艺、第二相掺杂、热处理工艺等方面的研究进展，总结了不同的制备工艺对Sm(CoFeCuZr)_z永磁体微观结构和磁性能的影响，并对新工艺在高性能的Sm(CoFeCuZr)_z永磁体制备中推广应用进行了展望。
Keyword ：
铸态合金 铸态合金 热处理 热处理 Sm(CoFeCuZr)_z永磁体 Sm(CoFeCuZr)_z永磁体 制粉 制粉 制备工艺 制备工艺
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| GB/T 7714 | 尚志丰 , 马喜龙 , 杨建军 et al. Sm(CoFeCuZr)_z永磁制备新工艺研究进展 [J]. | 稀土 , 2024 , 45 (01) : 1-15 . |
| MLA | 尚志丰 et al. "Sm(CoFeCuZr)_z永磁制备新工艺研究进展" . | 稀土 45 . 01 (2024) : 1-15 . |
| APA | 尚志丰 , 马喜龙 , 杨建军 , 王云峤 , 张东涛 , 岳明 . Sm(CoFeCuZr)_z永磁制备新工艺研究进展 . | 稀土 , 2024 , 45 (01) , 1-15 . |
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Abstract ：
Effect of hydrogen pressure on hydrogenation and pulverization behavior of Sm(CoFeCuZr)7.6 alloy prepared by plate mold (PM) and strip casting (SC) has been systematically investigated. Increasing hydrogen pres-sure can improve the hydrogenation ability. Both the PM and SC have the similar hydrogen absorption process, which can be divided into two stages. The first stage follows the Sieverts' law (1-5 MPa) while the second one deviates from the Sieverts' law (5-10 MPa). Rietveld refinement shows that the hydrogen ab-sorption causes different lattice distortion of different phases without changing the phase structure. The internal stress caused by such lattice distortion is the primary reason that accelerates the pulverization of the alloys, and increasing hydrogen pressure can lead to the decrease of particle size of the PM and SC alloys. The hydrogen decrepitation (HD) process are studied in detail based on these results. The hydrogen ab-sorption mechanism of Sm(CoFeCuZr)7.6 alloy can be regarded as a hydrogen dissolution process without phase transformation. In addition, the existence of a large amount of fine grains in the SC has an adverse effect on the alignment, which can be optimized by taking effective methods to reduce the overcooling rate. This work proves that the SC, HD and jet milling process can be a promising new approach to powder preparation for high-performance Sm(CoFeCuZr)z sintered magnets.(c) 2022 Elsevier B.V. All rights reserved.
Keyword ：
Hydrogen pressure Hydrogen pressure Hydrogenation behavior Hydrogenation behavior Sm(CoFeCuZr)z magnets Sm(CoFeCuZr)z magnets Alignment characteristics Alignment characteristics Pulverization behavior Pulverization behavior Hydrogenation mechanism Hydrogenation mechanism
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| GB/T 7714 | Yang, Jianjun , Zhang, Dongtao , Zhang, Hongguo et al. Effect of hydrogen pressure on hydrogenation and pulverization behavior of Sm(CoFeCuZr)z ingot and strip casting flake [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2023 , 930 . |
| MLA | Yang, Jianjun et al. "Effect of hydrogen pressure on hydrogenation and pulverization behavior of Sm(CoFeCuZr)z ingot and strip casting flake" . | JOURNAL OF ALLOYS AND COMPOUNDS 930 (2023) . |
| APA | Yang, Jianjun , Zhang, Dongtao , Zhang, Hongguo , Shang, Zhifeng , Wang, Hong , Meng, Chengzhen et al. Effect of hydrogen pressure on hydrogenation and pulverization behavior of Sm(CoFeCuZr)z ingot and strip casting flake . | JOURNAL OF ALLOYS AND COMPOUNDS , 2023 , 930 . |
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Abstract ：
Realizing the deformation and texture formation mechanism of the HD SmCo5 magnets were rarely re-ported, which restricted the further enhancement of its magnetic properties. Here, we prepared the ani-sotropic SmCo5 nanocrystalline magnets by hot pressing and hot deformation (HP-HD). The magnetic properties, texture, and microstructure of the magnets with different height reductions were systematically studied. Based on the characterization results, for the HD SmCo5 nanocrystalline magnets, it is inferred that the deformation and texture formation mechanism are attributed to the coordination of precipitated phases, dislocation slip, stacking fault formation, and regular grain rearrangement.(c) 2022 Published by Elsevier B.V.
Keyword ：
Deformation mechanism Deformation mechanism Anisotropic nanocrystalline magnet Anisotropic nanocrystalline magnet C-axis texture C-axis texture Hot deformation Hot deformation Microdefect Microdefect
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| GB/T 7714 | Wang, Hong , Zhang, Dongtao , Li, Yuqing et al. Deformation and texture formation mechanism of hot-deformed SmCo5 nanocrystalline magnets [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2023 , 934 . |
| MLA | Wang, Hong et al. "Deformation and texture formation mechanism of hot-deformed SmCo5 nanocrystalline magnets" . | JOURNAL OF ALLOYS AND COMPOUNDS 934 (2023) . |
| APA | Wang, Hong , Zhang, Dongtao , Li, Yuqing , Yang, Jianjun , Song, Wenna , Liu, Weiqiang et al. Deformation and texture formation mechanism of hot-deformed SmCo5 nanocrystalline magnets . | JOURNAL OF ALLOYS AND COMPOUNDS , 2023 , 934 . |
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Abstract ：
采用密度泛函理论方法系统研究分析了四方结构MnGa合金体在a轴1GPa应力下的结构、形成、电子性质和磁性质.结果表明，应力下MnGa合金a, b轴晶格参数增大，c轴晶格参数减小，三轴夹角有偏离90°的趋势，晶胞体积增大. Mn-Ga不成键，Mn-Mn之间的强键作用进一步增强，Ga-Ga之间的强键作用消失. Mn-Mn结合键长和Ga-Ga结合键长均减小，而Mn-Ga间距增大，排斥作用减弱.应力下MnGa合金形成焓由-4.85 eV减小到-5.4 eV,其更容易生成.应力下其能带整体向下移动，导带和浅能级价带分布较宽，有效质量较小；深能级价带分布较窄，有效质量较大.自旋向下的电子能带没有带隙，自旋...
Keyword ：
电子性质 电子性质 MnGa合金 MnGa合金 磁性质 磁性质 应力 应力
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| GB/T 7714 | 路清梅 , 张飞鹏 , 房慧 et al. 应力下MnGa合金体电子性质及磁性质的研究 [J]. | 原子与分子物理学报 , 2023 , 40 (01) : 134-142 . |
| MLA | 路清梅 et al. "应力下MnGa合金体电子性质及磁性质的研究" . | 原子与分子物理学报 40 . 01 (2023) : 134-142 . |
| APA | 路清梅 , 张飞鹏 , 房慧 , 李虹霏 , 刘卫强 , 张东涛 et al. 应力下MnGa合金体电子性质及磁性质的研究 . | 原子与分子物理学报 , 2023 , 40 (01) , 134-142 . |
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Abstract ：
Nanocomposite magnets have attracted much attention because of their ultra-high theoretical magnetic energy product and saving rare earth resources. In this study, the Fe93.5Si6.5 with higher hardness than the most common soft magnetic phase (alpha-Fe) was used to synthesize SmCo5/Fe-Si nanocomposite magnets, and its nanosized process was studied. The results showed that Fe-Si can be well dispersed into SmCo5 matrix through 12 hours of ball milling, and appeared in fine and evenly distributed grains in the SmCo5/Fe-Si nanocomposites, indicating it is suitable for soft magnetic phase. The nanosized process of Fe-Si phase can be summarized as from the irregular shape of agglomeration, to long chain, and finally too uniformly dispersed Fe-Si particles with increased milling time. As a result, the SmCo5/Fe-Si nanocomposite magnet with the optimal maximum magnetic energy product was 14.3 MGOe, accompanied by remanence of 9.5 kG and coercivity of 8.2 kOe. Our results show that by using Fe-Si with high hardness as the soft magnetic phase, the prepared nanocomposite magnet not only has good properties, but also can be expected that the two phases with closer mechanical properties can be deformed harmoniously. (C) 2022 Author(s).
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| GB/T 7714 | Zhang, Yu , Li, Yuqing , Liu, Weiqiang et al. Fe-Si and its nanocrystallization as soft magnetic phase in SmCo-based nanocomposites [J]. | AIP ADVANCES , 2022 , 12 (3) . |
| MLA | Zhang, Yu et al. "Fe-Si and its nanocrystallization as soft magnetic phase in SmCo-based nanocomposites" . | AIP ADVANCES 12 . 3 (2022) . |
| APA | Zhang, Yu , Li, Yuqing , Liu, Weiqiang , Yue, Ming , Zhang, Dongtao , Zhang, Hongguo . Fe-Si and its nanocrystallization as soft magnetic phase in SmCo-based nanocomposites . | AIP ADVANCES , 2022 , 12 (3) . |
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Abstract ：
The effect of Fe-rich content on the microstructure, phase structure, elements distribution, and magnetic properties of Sm(Co0.91-xFexCu0.07Zr0.02)7.6 (x = 0.22, 0.30, and 0.35) magnets has been investigated systematically. With the increase of Fe content, the 2:17H, 2:17R, and 1:3R phases appeared in the Fe-rich solid solution. The different phase structures in the high-resolution transmission electron microscopy (HRTEM) images showed a locally short-range ordered state with dislocations. The presence of 2:17R phase and 1:3R phase was negative to the spinodal decomposition during the aging stage. In addition, the high Fe content caused Cu element enrichment in some area of the final state magnet, which further affected the formation of cellular structure. The Fe content increased from x = 0.22 to x = 0.35, the average cell size increased from 83.67 to 112.46 nm, the thickness of cell boundary increased from 9.6 to 18.25 nm, and the density of Zr-rich platelets increased from 0.036 to 0.06 nm. Furthermore, the defective cellular structures in the magnet ( x = 0.35) with incomplete and discontinuous cell boundaries had weak pinning field and poor coercivity. Moreover, the magnetooptical Kerr optical microscope observation revealed that the domain width of magnet ( x = 0.35) was significantly higher than that of magnet ( x = 0.22), and the reversal magnetic domain was formed first in the magnet ( x = 0.35), which caused a poor coercivity. © 1965-2012 IEEE.
Keyword ：
Cellular structure; magnetic domains; phase structure; Sm(CoFeCuZr)z magnets Cellular structure; magnetic domains; phase structure; Sm(CoFeCuZr)z magnets
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| GB/T 7714 | Jia, J.H. , Zhang, D.T. , Yang, J.J. et al. Phase Structure and Properties of Fe-Rich 2:17-Type Sm-Co Sintered Magnets [J]. | IEEE Transactions on Magnetics , 2022 , 58 (8) . |
| MLA | Jia, J.H. et al. "Phase Structure and Properties of Fe-Rich 2:17-Type Sm-Co Sintered Magnets" . | IEEE Transactions on Magnetics 58 . 8 (2022) . |
| APA | Jia, J.H. , Zhang, D.T. , Yang, J.J. , Xie, Z.H. , Li, Y.Q. , Zhang, H.G. et al. Phase Structure and Properties of Fe-Rich 2:17-Type Sm-Co Sintered Magnets . | IEEE Transactions on Magnetics , 2022 , 58 (8) . |
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Abstract ：
Microstructure and magnetic properties were studied for the commercial Sm(CoFeCuZr)z magnets before and after post annealing treatment. The results show that the phases composition and orientation of the magnet do not change after post annealing treatment, but the substantial redistribution of Cu element within multiscale (the microscale crystal grain and the nanoscale cellular structure) is observed simul-taneously. In detail, along with the Cu redistribution, the thickness of the Cu-rich Sm(Co,Cu)5 cell boundary becomes thinner, and the Cu concentration in the boundary increases sharply. The pinning field of domain walls and corresponding coercivity increase remarkably with slight remanence and maximum energy product loss, and the overall magnetic performance of (BH)max (MGOe) thorn Hcj (kOe) increases by 54.3% as a result. Moreover, the thermal stability of the magnet improves as well. On the other hand, Cu-lean phenomenon was observed along the grain boundary region, triggering to magnetic domain reversal process and slightly undermining the squareness of the demagnetization curve of the magnet.(c) 2021 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
Keyword ：
Magnetic properties Magnetic properties Rare earth permanent magnets Rare earth permanent magnets Post annealing treatment Post annealing treatment Cu distribution Cu distribution Sm(CoFeCuZr) Z magnets Sm(CoFeCuZr) Z magnets
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| GB/T 7714 | Yang, Jianjun , Zhang, Dongtao , Xie, Zhihong et al. Tremendous enhancement of magnetic performance for Sm(CoFeCuZr)z magnet based on multiscale copper redistribution* [J]. | JOURNAL OF RARE EARTHS , 2022 , 40 (10) : 1592-1597 . |
| MLA | Yang, Jianjun et al. "Tremendous enhancement of magnetic performance for Sm(CoFeCuZr)z magnet based on multiscale copper redistribution*" . | JOURNAL OF RARE EARTHS 40 . 10 (2022) : 1592-1597 . |
| APA | Yang, Jianjun , Zhang, Dongtao , Xie, Zhihong , Shang, Zhifeng , Li, Yuqing , Liu, Weiqiang et al. Tremendous enhancement of magnetic performance for Sm(CoFeCuZr)z magnet based on multiscale copper redistribution* . | JOURNAL OF RARE EARTHS , 2022 , 40 (10) , 1592-1597 . |
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Abstract ：
SmCo7-based permanent magnets with a TbCu7-type structure have excellent high-temperature performance. However, most of the previously reported SmCo7 nanocrystalline magnets were isotropic, which limited their application. So the preparation of anisotropic SmCo7 magnets with preferred texture is still a challenge. In this work, we prepared anisotropic SmCo6.8Hf0.2 nanocrystalline magnets by hot pressing and hot deformation method. EBSD results indicated that the {0001} orientation texture of the hot deformed magnet was remarkably preferred, which further improved the remanence. Subsequently, the structural evolution process was systematically characterized by TEM. It provides crucial insight for developing high-performance SmCo7-based magnets. Impact Statement: Up to now, most of the previously reported SmCo7 nanocrystalline magnets were isotropic, which limited their application. This work opens up new opportunities to create high-performance SmCo7-based nanostructured magnets.
Keyword ：
anisotropic nanocrystalline magnet anisotropic nanocrystalline magnet precipitated phase precipitated phase phase transition phase transition Hot deformation Hot deformation twins twins
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| GB/T 7714 | Wang, Hong , Zhang, Dongtao , Li, Yuqing et al. Structural evolution of anisotropic SmCo6.8Hf0.2 nanocrystalline magnet prepared by hot deformation [J]. | MATERIALS RESEARCH LETTERS , 2022 , 10 (10) : 648-655 . |
| MLA | Wang, Hong et al. "Structural evolution of anisotropic SmCo6.8Hf0.2 nanocrystalline magnet prepared by hot deformation" . | MATERIALS RESEARCH LETTERS 10 . 10 (2022) : 648-655 . |
| APA | Wang, Hong , Zhang, Dongtao , Li, Yuqing , Yang, Yuqi , Yang, Jianjun , Liu, Weiqiang et al. Structural evolution of anisotropic SmCo6.8Hf0.2 nanocrystalline magnet prepared by hot deformation . | MATERIALS RESEARCH LETTERS , 2022 , 10 (10) , 648-655 . |
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Abstract ：
A novel hot extrusion method to fabricate anisotropic nanocrystalline SmCo5 magnet was investigated. The results indicate that the hot-extruded (HE) SmCo5 magnet obtains a strong c-axis texture in perpendicular to the extrusion direction, but the texture strength is clearly different in different regions. The deformation degree plays a key role in the formation of c-axis crystallographic texture and magnetic anisotropy. In surface region of the HE magnet, the deformation degree of grains is the biggest, and the c-axis texture and remanence are the strongest. Furthermore, deformation mechanism of the HE SmCo5 magnet was preliminarily discussed.
Keyword ：
nanocrystalline nanocrystalline Anisotropic SmCo5 magnet Anisotropic SmCo5 magnet hot extrusion hot extrusion deformation mechanism deformation mechanism
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| GB/T 7714 | Wang, Hong , Zhang, Dongtao , Tang, Yuyang et al. Anisotropic Nanocrystalline SmCo5 Permanent Magnet Prepared by Hot Extrusion [J]. | IEEE TRANSACTIONS ON MAGNETICS , 2022 , 58 (2) . |
| MLA | Wang, Hong et al. "Anisotropic Nanocrystalline SmCo5 Permanent Magnet Prepared by Hot Extrusion" . | IEEE TRANSACTIONS ON MAGNETICS 58 . 2 (2022) . |
| APA | Wang, Hong , Zhang, Dongtao , Tang, Yuyang , Yang, Jianjun , Li, Yuqing , Liu, Weiqiang et al. Anisotropic Nanocrystalline SmCo5 Permanent Magnet Prepared by Hot Extrusion . | IEEE TRANSACTIONS ON MAGNETICS , 2022 , 58 (2) . |
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Abstract ：
基于密度泛函理论方法系统研究了四方结构MnGa合金体的结构、形成、电子结构和磁性质。结果表明,四方MnGa合金晶胞的生成焓为-4.85 eV,高于一些不含d电子的体系。其呈现导体的能带结构,其中d电子主要形成深能级价带,定域性最强。四方MnGa合金存在着明显的自旋极化,靠近费米能级两侧的s电子和靠近费米能级下方的p电子具有较弱的自旋极化。形成浅能级价带和导带的d电子产生高强度的自旋极化,对磁性质贡献较大。Mn的s电子和Mn的p电子自旋极化作用较弱,Mn的d电子形成浅能级价带和导带,自旋极化作用最强。形成深能级价带的Ga的d电子自旋极化作用较弱,不同位置的Ga原子的自旋极化不同。四方MnGa合金...
Keyword ：
MnGa合金 MnGa合金 磁性质 磁性质 磁性材料 磁性材料 密度泛函理论 密度泛函理论 电子结构 电子结构
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| GB/T 7714 | 张飞鹏 , 路清梅 , 李虹霏 et al. MnGa合金体的电子结构与磁性质的研究 [J]. | 人工晶体学报 , 2022 , 51 (01) : 65-71 . |
| MLA | 张飞鹏 et al. "MnGa合金体的电子结构与磁性质的研究" . | 人工晶体学报 51 . 01 (2022) : 65-71 . |
| APA | 张飞鹏 , 路清梅 , 李虹霏 , 房慧 , 刘卫强 , 张东涛 et al. MnGa合金体的电子结构与磁性质的研究 . | 人工晶体学报 , 2022 , 51 (01) , 65-71 . |
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