Hao Chen , Hongguo Zhang , Weiqiang Liu , Yuqing Li , Zhanjia Wang , Haihui Wu , Lichao Yu , Ming Yue
{"title":"克服铈基烧结磁体的晶界扩散挑战:La取代作为增强矫顽力的途径","authors":"Hao Chen , Hongguo Zhang , Weiqiang Liu , Yuqing Li , Zhanjia Wang , Haihui Wu , Lichao Yu , Ming Yue","doi":"10.1016/j.actamat.2024.120690","DOIUrl":null,"url":null,"abstract":"<div><div>This study addresses the challenges of low diffusion efficiency and minimal coercivity enhancement in Ce-based sintered magnets through the grain boundary diffusion (GBD) technique. By conducting a comprehensive experimental and theoretical analysis of La-substituted Ce-based magnets, we have uncovered the detrimental impact of the REFe<sub>2</sub> phase on grain boundary (GB) structure and the diffusion process. Our findings confirm that an optimal La substitution for Ce effectively mitigates these issues. This substitution reduces the stability and Dy content of the REFe<sub>2</sub> phase while enhances the continuity of the lamellar GB phases. Consequently, the Dy element utilized in the diffusion process achieves a greater depth of penetration and a more uniform distribution, leading to a significant coercivity increase of 4.28 kOe in the GBD magnet with the ideal La content, an 8.35 % improvement over the La-free magnet. This research reveals the underlying mechanisms and offers a viable solution for enhancing the GBD effect in Ce-based sintered magnets. Furthermore, it underscores the pivotal interplay between phase stability, grain boundary structure, and diffusion dynamics in the advancement of next-generation GBD techniques for permanent magnets.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"285 ","pages":"Article 120690"},"PeriodicalIF":9.3000,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Overcoming grain boundary diffusion challenges in Ce-based sintered magnets: La substitution as a pathway to enhanced coercivity\",\"authors\":\"Hao Chen , Hongguo Zhang , Weiqiang Liu , Yuqing Li , Zhanjia Wang , Haihui Wu , Lichao Yu , Ming Yue\",\"doi\":\"10.1016/j.actamat.2024.120690\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study addresses the challenges of low diffusion efficiency and minimal coercivity enhancement in Ce-based sintered magnets through the grain boundary diffusion (GBD) technique. By conducting a comprehensive experimental and theoretical analysis of La-substituted Ce-based magnets, we have uncovered the detrimental impact of the REFe<sub>2</sub> phase on grain boundary (GB) structure and the diffusion process. Our findings confirm that an optimal La substitution for Ce effectively mitigates these issues. This substitution reduces the stability and Dy content of the REFe<sub>2</sub> phase while enhances the continuity of the lamellar GB phases. Consequently, the Dy element utilized in the diffusion process achieves a greater depth of penetration and a more uniform distribution, leading to a significant coercivity increase of 4.28 kOe in the GBD magnet with the ideal La content, an 8.35 % improvement over the La-free magnet. This research reveals the underlying mechanisms and offers a viable solution for enhancing the GBD effect in Ce-based sintered magnets. Furthermore, it underscores the pivotal interplay between phase stability, grain boundary structure, and diffusion dynamics in the advancement of next-generation GBD techniques for permanent magnets.</div></div>\",\"PeriodicalId\":238,\"journal\":{\"name\":\"Acta Materialia\",\"volume\":\"285 \",\"pages\":\"Article 120690\"},\"PeriodicalIF\":9.3000,\"publicationDate\":\"2024-12-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Acta Materialia\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1359645424010383\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Materialia","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1359645424010383","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Overcoming grain boundary diffusion challenges in Ce-based sintered magnets: La substitution as a pathway to enhanced coercivity
This study addresses the challenges of low diffusion efficiency and minimal coercivity enhancement in Ce-based sintered magnets through the grain boundary diffusion (GBD) technique. By conducting a comprehensive experimental and theoretical analysis of La-substituted Ce-based magnets, we have uncovered the detrimental impact of the REFe2 phase on grain boundary (GB) structure and the diffusion process. Our findings confirm that an optimal La substitution for Ce effectively mitigates these issues. This substitution reduces the stability and Dy content of the REFe2 phase while enhances the continuity of the lamellar GB phases. Consequently, the Dy element utilized in the diffusion process achieves a greater depth of penetration and a more uniform distribution, leading to a significant coercivity increase of 4.28 kOe in the GBD magnet with the ideal La content, an 8.35 % improvement over the La-free magnet. This research reveals the underlying mechanisms and offers a viable solution for enhancing the GBD effect in Ce-based sintered magnets. Furthermore, it underscores the pivotal interplay between phase stability, grain boundary structure, and diffusion dynamics in the advancement of next-generation GBD techniques for permanent magnets.
期刊介绍:
Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.