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学者姓名：张东涛
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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 ：
一种可降低残余碳危害的稀土永磁材料Pr2Fe14C的相稳定性提升方法，涉及永磁材料技术领域。由具有如下所示化学计量比的物质组成：(Pr, RE)2Fe14C；其中RE＝Sm、Gd；制备工艺包括配料、熔炼、熔体快淬、退火，其中，熔体快淬是采用铜辊转速20≤V≤40m/s的真空快淬炉在保护气氛下进行，退火是在保护气氛下500～1100℃的退火炉中进行。在本发明利用Sm2Fe14C和Gd2Fe14C相的高稳定性，用Sm、Gd原子置换Pr2Fe14C中的部分Pr原子，扩展了Pr2Fe14C相的稳定区间，制得了纯相的(Pr, RE)2Fe14C型稀土永磁材料。
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| GB/T 7714 | 张红国 , 白祯至 , 岳明 et al. 一种可降低残余碳危害的稀土永磁材料Pr2Fe14C的相稳定性提升方法 : CN202310244834.6[P]. | 2023-03-14 . |
| MLA | 张红国 et al. "一种可降低残余碳危害的稀土永磁材料Pr2Fe14C的相稳定性提升方法" : CN202310244834.6. | 2023-03-14 . |
| APA | 张红国 , 白祯至 , 岳明 , 张东涛 , 刘卫强 , 路清梅 . 一种可降低残余碳危害的稀土永磁材料Pr2Fe14C的相稳定性提升方法 : CN202310244834.6. | 2023-03-14 . |
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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 ：
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 ：
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 ：
一种定向组装的各向异性纳米晶复合稀土永磁体及其制备方法，属于稀土永磁材料制备技术领域。该方法所制备的磁体由具有高饱和磁化强度和高磁各向异性的两种基元根据逐层定向组装而成。所述制备方法包括：制备纳米晶/非晶稀土永磁粉作为组装基元；定向组装并压制成热变形前驱体；对所述前驱体进行热变形，获得定向组装的各向异性纳米晶复合稀土永磁体。本发明制备的定向组装纳米晶复合稀土永磁体可以协同远程的静磁相互作用和近程的交换耦合作用实现磁性能显著提高。
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| GB/T 7714 | 李玉卿 , 刘卫强 , 滕媛 et al. 一种定向组装的各向异性纳米晶复合稀土永磁体及其制备方法 : CN202210291872.2[P]. | 2022-03-22 . |
| MLA | 李玉卿 et al. "一种定向组装的各向异性纳米晶复合稀土永磁体及其制备方法" : CN202210291872.2. | 2022-03-22 . |
| APA | 李玉卿 , 刘卫强 , 滕媛 , 岳明 , 徐晓厂 , 张东涛 et al. 一种定向组装的各向异性纳米晶复合稀土永磁体及其制备方法 : CN202210291872.2. | 2022-03-22 . |
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Abstract ：
一种基于一级和二级相变材料的复合磁制冷材料及制备方法，属于磁性功能材料中的磁制冷材料领域。选取一种具有基于一级相变磁热效应的磁制冷材料(A)和另一种具有基于二级相变磁热效应的磁制冷材料(B)，其中一级相变磁制冷材料(A)具有较强脆性，而二级相变磁制冷材料(B)具有较高的力学性能。根据本发明制备的一级相变材料磁制冷材料(A)与二级相变磁制冷材料材料(B)的复合磁体能改善非相变材料对磁热性能的稀释，具有较高的力学性能与热传导性能。
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| GB/T 7714 | 张红国 , 吴正 , 岳明 et al. 一种基于一级和二级相变材料的复合磁制冷材料及制备方法 : CN202210266608.3[P]. | 2022-03-16 . |
| MLA | 张红国 et al. "一种基于一级和二级相变材料的复合磁制冷材料及制备方法" : CN202210266608.3. | 2022-03-16 . |
| APA | 张红国 , 吴正 , 岳明 , 张东涛 , 刘卫强 , 路清梅 . 一种基于一级和二级相变材料的复合磁制冷材料及制备方法 : CN202210266608.3. | 2022-03-16 . |
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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 ：
Exchange-coupled magnets are promising candidates for a new generation of permanent magnets. Here, we investigated the effect of soft magnetic shell thickness and the aspect ratio of the hard magnetic core on the magnetic properties for isolated core/shell cylinder exchange-coupled magnets, as well as the packing effect of the cylindrical array via a micromagnetic simulation method. It was found that the shape anisotropy contributions to the magnetic properties in the cylindrical core/shell exchange-coupled magnets are closely related to the thickness of the soft magnetic shell. When the soft magnetic shell is thin, the magnetic properties are dominated by the hard-soft exchange coupling effects, and the contributions of shape anisotropy are quite limited. When the soft magnetic shell is relatively thick, utilizing shape anisotropy would be an effective method to improve the magnetic performance of hard-soft exchange-coupled magnets. The present work provides an in-depth fundamental understanding of the underlying magnetization reversal mechanism. This work could be useful for designing high-performance permanent magnets and avoiding pitfalls.
Keyword ：
shape anisotropy shape anisotropy permanent magnets permanent magnets core core shell structure shell structure micromagnetic simulation micromagnetic simulation exchange-coupling exchange-coupling
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| GB/T 7714 | Yang, Zhi , Chen, Yuanyuan , Liu, Weiqiang et al. Effects of Shape Anisotropy on Hard-Soft Exchange-Coupled Permanent Magnets [J]. | NANOMATERIALS , 2022 , 12 (8) . |
| MLA | Yang, Zhi et al. "Effects of Shape Anisotropy on Hard-Soft Exchange-Coupled Permanent Magnets" . | NANOMATERIALS 12 . 8 (2022) . |
| APA | Yang, Zhi , Chen, Yuanyuan , Liu, Weiqiang , Wang, Yatao , Li, Yuqing , Zhang, Dongtao et al. Effects of Shape Anisotropy on Hard-Soft Exchange-Coupled Permanent Magnets . | NANOMATERIALS , 2022 , 12 (8) . |
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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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