Formation of cellular/lamellar nanostructure in Sm$_2$Co$_{17}$-type binary and ternary Sm-Co-Zr magnets
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2024
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| author | Polin, Nikita Skokov, Konstantin P. Aubert, Alex Zhang, Hongguo Ekitli, Burçak Adabifiroozjaei, Esmaeil Molina-Luna, Leopoldo Gutfleisch, Oliver Gault, Baptiste |
| author_facet | Polin, Nikita Skokov, Konstantin P. Aubert, Alex Zhang, Hongguo Ekitli, Burçak Adabifiroozjaei, Esmaeil Molina-Luna, Leopoldo Gutfleisch, Oliver Gault, Baptiste |
| contents | 2:17 SmCo magnets with a quinary composition of Sm(Co,Cu,Fe,Zr)$_{7+δ}$ are industrially relevant hard magnets used in high temperature and corrosive environments. Their complex cellular/lamellar nanostructure, consisting of ordered 2:17 phase cells, 1:5 phase cell boundaries and Z-phase (Zr-rich) lamellae, is essential for their high coercivity. However, the system's complexity makes it challenging to determine the contribution of each element or microstructural feature to coercivity. To disentangle the microstructure-property relationships, we simplified the system to binary and ternary SmCo$_{7.7-x}$Zr$_x$ (with $x = 0$ and 0.1) magnets and conducted detailed micro- to atomic-scale analyses. Only Zr-containing magnets formed a cellular/lamellar nanostructure akin to industrial magnets, in Zr-rich regions with at least 1 at.% Zr, but without achieving high coercivity due to low elemental gradients in absence of Cu across cell boundaries. Data from Zr-poor areas of SmCo$_{7.6}$Zr$_{0.1}$ suggests that 2:17 phase twin boundaries facilitate cellular nanostructure formation by providing inhomogeneities for heterogeneous nucleation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_11274 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Formation of cellular/lamellar nanostructure in Sm$_2$Co$_{17}$-type binary and ternary Sm-Co-Zr magnets Polin, Nikita Skokov, Konstantin P. Aubert, Alex Zhang, Hongguo Ekitli, Burçak Adabifiroozjaei, Esmaeil Molina-Luna, Leopoldo Gutfleisch, Oliver Gault, Baptiste Materials Science 2:17 SmCo magnets with a quinary composition of Sm(Co,Cu,Fe,Zr)$_{7+δ}$ are industrially relevant hard magnets used in high temperature and corrosive environments. Their complex cellular/lamellar nanostructure, consisting of ordered 2:17 phase cells, 1:5 phase cell boundaries and Z-phase (Zr-rich) lamellae, is essential for their high coercivity. However, the system's complexity makes it challenging to determine the contribution of each element or microstructural feature to coercivity. To disentangle the microstructure-property relationships, we simplified the system to binary and ternary SmCo$_{7.7-x}$Zr$_x$ (with $x = 0$ and 0.1) magnets and conducted detailed micro- to atomic-scale analyses. Only Zr-containing magnets formed a cellular/lamellar nanostructure akin to industrial magnets, in Zr-rich regions with at least 1 at.% Zr, but without achieving high coercivity due to low elemental gradients in absence of Cu across cell boundaries. Data from Zr-poor areas of SmCo$_{7.6}$Zr$_{0.1}$ suggests that 2:17 phase twin boundaries facilitate cellular nanostructure formation by providing inhomogeneities for heterogeneous nucleation. |
| title | Formation of cellular/lamellar nanostructure in Sm$_2$Co$_{17}$-type binary and ternary Sm-Co-Zr magnets |
| topic | Materials Science |
| url | https://arxiv.org/abs/2410.11274 |