Local Phase Segregation Induced by Ion Milling in 2:17-Type Sm-Co Based Magnets
Transmission electron microscopy (TEM) is indispensable to reveal the cellular nanostructure of the 2:17-type Sm-Co based magnets which act as the first choice for high-temperature magnet-associated devices. However, structural deficiencies could be introduced into the TEM specimen during the ion mi...
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MDPI AG
2023-06-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/12/4378 |
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| author | Xin Song Yao Liu Wentao Jia Jian Li Xiaolian Liu Lizhong Zhao Tao Yuan Tianyu Ma |
| author_facet | Xin Song Yao Liu Wentao Jia Jian Li Xiaolian Liu Lizhong Zhao Tao Yuan Tianyu Ma |
| author_sort | Xin Song |
| collection | DOAJ |
| description | Transmission electron microscopy (TEM) is indispensable to reveal the cellular nanostructure of the 2:17-type Sm-Co based magnets which act as the first choice for high-temperature magnet-associated devices. However, structural deficiencies could be introduced into the TEM specimen during the ion milling process, which would provide misleading information to understand the microstructure–property relationship of such magnets. In this work, we performed a comparative investigation of the microstructure and microchemistry between two TEM specimens prepared under different ion milling conditions in a model commercial magnet Sm<sub>13</sub>Gd<sub>12</sub>Co<sub>50</sub>Cu<sub>8.5</sub>Fe<sub>13</sub>Zr<sub>3.5</sub> (wt.%). It is found that additional low-energy ion milling will preferably damage the 1:5H cell boundaries, while having no influence on the 2:17R cell phase. The structure of cell boundary transforms from hexagonal into face-centered-cubic. In addition, the elemental distribution within the damaged cell boundaries becomes discontinuous, segregating into Sm/Gd-rich and Fe/Co/Cu-rich portions. Our study suggested that in order to reveal the true microstructure of the Sm-Co based magnets, the TEM specimen should be carefully prepared to avoid structural damage and artificial deficiencies. |
| first_indexed | 2024-03-11T02:12:17Z |
| format | Article |
| id | doaj.art-5036b197cac14dd79c1bea41380eefaa |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T02:12:17Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-5036b197cac14dd79c1bea41380eefaa2023-11-18T11:25:25ZengMDPI AGMaterials1996-19442023-06-011612437810.3390/ma16124378Local Phase Segregation Induced by Ion Milling in 2:17-Type Sm-Co Based MagnetsXin Song0Yao Liu1Wentao Jia2Jian Li3Xiaolian Liu4Lizhong Zhao5Tao Yuan6Tianyu Ma7Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, ChinaFrontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, ChinaFrontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, ChinaFrontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, ChinaCollege of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, ChinaCollege of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, ChinaFrontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, ChinaFrontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, ChinaTransmission electron microscopy (TEM) is indispensable to reveal the cellular nanostructure of the 2:17-type Sm-Co based magnets which act as the first choice for high-temperature magnet-associated devices. However, structural deficiencies could be introduced into the TEM specimen during the ion milling process, which would provide misleading information to understand the microstructure–property relationship of such magnets. In this work, we performed a comparative investigation of the microstructure and microchemistry between two TEM specimens prepared under different ion milling conditions in a model commercial magnet Sm<sub>13</sub>Gd<sub>12</sub>Co<sub>50</sub>Cu<sub>8.5</sub>Fe<sub>13</sub>Zr<sub>3.5</sub> (wt.%). It is found that additional low-energy ion milling will preferably damage the 1:5H cell boundaries, while having no influence on the 2:17R cell phase. The structure of cell boundary transforms from hexagonal into face-centered-cubic. In addition, the elemental distribution within the damaged cell boundaries becomes discontinuous, segregating into Sm/Gd-rich and Fe/Co/Cu-rich portions. Our study suggested that in order to reveal the true microstructure of the Sm-Co based magnets, the TEM specimen should be carefully prepared to avoid structural damage and artificial deficiencies.https://www.mdpi.com/1996-1944/16/12/4378Sm-Co magnetsion millingphase segregationTEM |
| spellingShingle | Xin Song Yao Liu Wentao Jia Jian Li Xiaolian Liu Lizhong Zhao Tao Yuan Tianyu Ma Local Phase Segregation Induced by Ion Milling in 2:17-Type Sm-Co Based Magnets Materials Sm-Co magnets ion milling phase segregation TEM |
| title | Local Phase Segregation Induced by Ion Milling in 2:17-Type Sm-Co Based Magnets |
| title_full | Local Phase Segregation Induced by Ion Milling in 2:17-Type Sm-Co Based Magnets |
| title_fullStr | Local Phase Segregation Induced by Ion Milling in 2:17-Type Sm-Co Based Magnets |
| title_full_unstemmed | Local Phase Segregation Induced by Ion Milling in 2:17-Type Sm-Co Based Magnets |
| title_short | Local Phase Segregation Induced by Ion Milling in 2:17-Type Sm-Co Based Magnets |
| title_sort | local phase segregation induced by ion milling in 2 17 type sm co based magnets |
| topic | Sm-Co magnets ion milling phase segregation TEM |
| url | https://www.mdpi.com/1996-1944/16/12/4378 |
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