Sm2Co17磁体胞状组织边缘2:17R'相的透射电子显微镜表征

doi:10.11900/0412.1961.2020.00412

金属学报

2021, Vol. 57

Issue (12): 1637-1644 DOI: 10.11900/0412.1961.2020.00412

研究论文

本期目录 | 过刊浏览

Sm₂Co₁₇磁体胞状组织边缘2:17R'相的透射电子显微镜表征

陈虹宇¹, 宋欣¹, 周相龙¹, 贾文涛¹, 袁涛¹^,², 马天宇¹(

)

^1.西安交通大学前沿科学技术研究院金属材料强度国家重点实验室西安 710049
^2.西南应用磁学所绵阳 621000

Identification of 2:17R' Cell Edge Phase in Sm₂Co₁₇-Type Permanent Magnets by Transmission Electron Microscopy

CHEN Hongyu¹, SONG Xin¹, ZHOU Xianglong¹, JIA Wentao¹, YUAN Tao¹^,², MA Tianyu¹(

)

^1.Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
^2.The Southwest Applied Magnetism Research Institute, Mianyang 621000, China

引用本文:

陈虹宇, 宋欣, 周相龙, 贾文涛, 袁涛, 马天宇. Sm₂Co₁₇磁体胞状组织边缘2:17R'相的透射电子显微镜表征[J]. 金属学报, 2021, 57(12): 1637-1644.
Hongyu CHEN, Xin SONG, Xianglong ZHOU, Wentao JIA, Tao YUAN, Tianyu MA. Identification of 2:17R' Cell Edge Phase in Sm₂Co₁₇-Type Permanent Magnets by Transmission Electron Microscopy[J]. Acta Metall Sin, 2021, 57(12): 1637-1644.

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摘要:

结合电子衍射、TEM明/暗场像和HRTEM像从[100]_2:17R和[101]_2:17R 2个晶带轴研究了具有纳米胞状组织的Sm₂₅Co_50.2Fe_16.2Cu_5.6Zr_3.0(质量分数，%)钉扎型磁体胞边缘的微结构。结果表明，胞状组织边缘存在菱方结构的2:17R'相，与ABCA 3层堆垛周期的2:17R相相比有一层{001}基面原子错排，造成畴壁能密度高于胞内的2:17R相，从而产生不利于方形度的排斥型畴壁钉扎。进一步的对比研究表明，2:17R'相的超晶格衍射斑点可覆盖实验观察到的所有卫星斑，排除了之前文献中根据部分卫星斑所认为的2:17H相或Sm_n_{+ 1}Co₅_n_{- 1}相。因此，本工作为理解Sm₂(Co, M)₁₇磁体方形度低的微结构根源提供了新证据。

关键词 ：永磁材料, Sm-Co磁体, 电子衍射, 缺陷, TEM表征

Abstract：

Pinning-controlled Sm₂(Co, M)₁₇ (M = Fe, Cu, and Zr) magnets with cellular nanostructures are the strongest high-temperature permanent magnets. The squareness factor of such magnets is smaller than those of nucleation-controlled permanent magnets, leading to a lower-than-ideal maximum energy product. One of the main reasons for this poor squareness is that the pinning strength is weaker at cell edges than at 1:5H cell boundaries. However, the structure of these edges remains a topic of debate. To identify the microstructure of cell edges, electron diffraction, TEM bright/dark field imaging, and HRTEM imaging on a model magnet Sm₂₅Co_50.2Fe_16.2Cu_5.6Zr_3.0 (mass fraction, %) were performed using both [100]_2:17R and [101]_2:17R zone axes. The results revealed a rhombohedral 2:17R' phase at some of the edges, with one faulting basal layer in the 2:17R lattice. Further comparative investigations revealed that all the extra superlattice reflections result from the 2:17R' phase, excluding the previously identified 2:17H or Sm_n_{+ 1}Co₅_n_{- 1} or their mixture that can only produce a part of such superlattice reflections. Owing to the 2:17R' phase with a faulted basal plane, the free energy at the cell edges is higher than that of the 2:17R cell interiors, leading to repulsive domain-wall-pinning unfavorable for the squareness factor. This study provides important evidence for understanding the microstructural origin of the poor squareness factor obtained for Sm₂(Co, M)₁₇ permanent magnets.

Key words： permanent magnet Sm-Co magnet electron diffraction defect TEM characterization

收稿日期: 2020-10-16

ZTFLH:

TG113.12

基金资助:国家自然科学基金项目(52071256);金属材料强度国家重点实验室开放课题项目(20192106)

作者简介: 陈虹宇，女，1993年生，硕士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00412 或 https://www.ams.org.cn/CN/Y2021/V57/I12/1637

图1 沿Sm25Co50.2Fe16.2Cu5.6Zr3.0磁体[100]2:17R和[101]2:17R晶带轴的TEM明、暗场像及选区电子衍射(SAED)花样

图2 Sm25Co50.2Fe16.2Cu5.6Zr3.0磁体微结构的HRTEM表征

图3 2:17H、1:5H、1:3R、2:7R和5:19R相沿平行于[100]2:17R和[101]2:17R晶带轴的模拟电子衍射花样

图4 Sm25Co42.9Fe23.5Cu5.6Zr3.0磁体中1:3R和2:7R相的TEM表征

图5 2:17R和2:17R'相的单胞、原子投影图和模拟的电子衍射花样

图6 修正的畴壁能密度分布示意图

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