Pub Date : 2026-02-02DOI: 10.1016/j.jmst.2026.01.039
Feifei Li, Xiaowei Zhang, Renquan Wang, Jun Li, Chang Liu, Lu Wang, Ying Liu
Ce substitution is a cost-effective strategy to reduce reliance on critical rare-earth (RE) elements in Nd-Fe-B magnets, but high substitution levels often lead to severe magnetic performance degradation. Here, the mechanism of Ce-induced microstructural degradation in hot-deformed (HD) magnets was elucidated, and a low-temperature processing strategy was proposed to mitigate this degradation and improve magnetic performance. Microstructural analyses of HD magnets and precursor ribbons with varying Ce contents revealed that Ce lowers the melting point of RE-rich phases and enhances their wettability with RE2Fe14B grains, thereby accelerating the migration of RE-rich phases along grain boundaries (GBs). This migration promotes abnormal grain growth, excessive formation of triple-junction phases, REFe2 precipitation, and depletion of intergranular boundary phases, collectively impairing magnetic performance. In contrast, low-temperature processing effectively suppressed such migration, resulting in a more uniform microstructure. Consequently, a 40 at.% Ce-substituted magnet achieved a record maximum energy product of 322 kJ/m3, together with a coercivity of 0.93 T and a remanence of 1.33 T, surpassing that of the reported high-Ce-content HD magnets. This work breaks a key bottleneck in light RE substitution, providing guidance for the design of low-cost, high-performance HD magnets.
{"title":"Tailoring RE-rich phase migration to suppress Ce-induced microstructural degradation in hot-deformed Nd-Fe-B magnets","authors":"Feifei Li, Xiaowei Zhang, Renquan Wang, Jun Li, Chang Liu, Lu Wang, Ying Liu","doi":"10.1016/j.jmst.2026.01.039","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.01.039","url":null,"abstract":"Ce substitution is a cost-effective strategy to reduce reliance on critical rare-earth (RE) elements in Nd-Fe-B magnets, but high substitution levels often lead to severe magnetic performance degradation. Here, the mechanism of Ce-induced microstructural degradation in hot-deformed (HD) magnets was elucidated, and a low-temperature processing strategy was proposed to mitigate this degradation and improve magnetic performance. Microstructural analyses of HD magnets and precursor ribbons with varying Ce contents revealed that Ce lowers the melting point of RE-rich phases and enhances their wettability with RE<sub>2</sub>Fe<sub>14</sub>B grains, thereby accelerating the migration of RE-rich phases along grain boundaries (GBs). This migration promotes abnormal grain growth, excessive formation of triple-junction phases, REFe<sub>2</sub> precipitation, and depletion of intergranular boundary phases, collectively impairing magnetic performance. In contrast, low-temperature processing effectively suppressed such migration, resulting in a more uniform microstructure. Consequently, a 40 at.% Ce-substituted magnet achieved a record maximum energy product of 322 kJ/m<sup>3</sup>, together with a coercivity of 0.93 T and a remanence of 1.33 T, surpassing that of the reported high-Ce-content HD magnets. This work breaks a key bottleneck in light RE substitution, providing guidance for the design of low-cost, high-performance HD magnets.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"396 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146101596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-28DOI: 10.1016/j.jmst.2025.12.059
Zhenyu Zhai, Yaxin Sun, Hai Wu, Congju Li
{"title":"Bead-like macroporous carbon nanofibers-AgFe alloy as cathode catalyst to enhance the performance of MFCs","authors":"Zhenyu Zhai, Yaxin Sun, Hai Wu, Congju Li","doi":"10.1016/j.jmst.2025.12.059","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.12.059","url":null,"abstract":"","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"74 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-28DOI: 10.1016/j.jmst.2026.01.032
Mengwei He, Yu Luo, Andrew Breen, Zhiyong Wang, Simon P. Ringer
{"title":"Short-range order analysis: A data-volume threshold criterion and the potential role of atom probe tomography","authors":"Mengwei He, Yu Luo, Andrew Breen, Zhiyong Wang, Simon P. Ringer","doi":"10.1016/j.jmst.2026.01.032","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.01.032","url":null,"abstract":"","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"44 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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