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- W4313443917 endingPage "118664" @default.
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- W4313443917 abstract "The intrinsic coercivity of Fe-rich Sm2Co17-type permanent magnets is closely associated with the unique cellular microstructures. Usually, the continuous distribution of cell boundaries is destroyed in Fe-rich Sm2Co17-type magnets. Herein, a relatively high maximum energy product of about 32.7 MGOe and a nearly 300% increase in intrinsic coercivity are observed for Fe-rich Sm2Co17-type permanent magnets via regulating the initial defects to introduce numerous 1:5H precipitates nucleation sites. Synchrotron XRD and HR-TEM results reveal that the solution-treated Fe-rich Sm2Co17-type magnets consist of supersaturated 1:7H phase and a partial 2:17R phase. Furthermore, the solution-treated magnet with a lower fraction of 2:17R phase was found to have a higher density of initial defects through positron annihilation spectroscopy measurement. In the magnet with a higher density of initial defects, high density of defects-aggregated cell boundaries and high internal stress promote the precipitation of 1:5H phase. Moreover, the ordering transformation of 2:17R phase was facilized during aging treatment, and elements segregation was promoted. These results present a novel way in designing high-performance Fe-rich Sm2Co17-type magnets." @default.
- W4313443917 created "2023-01-06" @default.
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- W4313443917 date "2023-02-01" @default.
- W4313443917 modified "2023-10-17" @default.
- W4313443917 title "Phase separation and chemistry evolution in Fe-rich Sm(CobalFe0.31Cu0.07Zr0.025)7.7 magnets: The effect of initial defect" @default.
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- W4313443917 doi "https://doi.org/10.1016/j.actamat.2022.118664" @default.
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