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Encompassing Investigation of the Correlation between Secondary Phase Formation, Heat Treatment and Coercivity for Nd–Fe–B Sintered Magnets by in situ HighTemperature Synchrotron X-ray Diffraction.

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Titel: Encompassing Investigation of the Correlation between Secondary Phase Formation, Heat Treatment and Coercivity for Nd–Fe–B Sintered Magnets by in situ HighTemperature Synchrotron X-ray Diffraction.
Autoren: Ishigami, Keisuke, Yoshinari, Akihiro, Iida, Hiroki, Nakamura, Hajime, Nakamura, Tetsuya, Okamoto, Satoshi
Quelle: Materials Transactions; 2025, Vol. 66 Issue 11, p1419-1424, 6p
Schlagwörter: HEAT treatment, MAGNETIC properties, MAGNETIC alloys, COERCIVE fields (Electronics), PHASE transitions, HIGH temperatures, PERMANENT magnets, X-ray diffraction
Abstract: The magnetic properties of Nd–Fe–B sintered magnets depend on the secondary phase and its microstructure, which in turn depend on the post-sintering annealing conditions. Therefore, clarifying the correlation between magnetic properties, secondary phases, and annealing conditions is crucial. In this study, we examined the dependence of the formation/decomposition of crystalline phases during the cooling process of Nd–Fe–B sintered magnets containing Ga and C on the heat-treatment temperature using synchrotron radiation high-temperature in situ X-ray diffraction (HT in situ XRD). We also analyzed the correlation between the secondary phase formation/decomposition and magnetic properties. As a result, the existence of a secondary phase that correlated with the magnetic properties was clarified. An exhaustive search was conducted to determine the optimum heat-treatment conditions for the formation of secondary phase correlated with coercivity, thereby demonstrating the usefulness of the HT in situ XRD method in the development of high-performance permanent magnets. [ABSTRACT FROM AUTHOR]
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Abstract:The magnetic properties of Nd–Fe–B sintered magnets depend on the secondary phase and its microstructure, which in turn depend on the post-sintering annealing conditions. Therefore, clarifying the correlation between magnetic properties, secondary phases, and annealing conditions is crucial. In this study, we examined the dependence of the formation/decomposition of crystalline phases during the cooling process of Nd–Fe–B sintered magnets containing Ga and C on the heat-treatment temperature using synchrotron radiation high-temperature in situ X-ray diffraction (HT in situ XRD). We also analyzed the correlation between the secondary phase formation/decomposition and magnetic properties. As a result, the existence of a secondary phase that correlated with the magnetic properties was clarified. An exhaustive search was conducted to determine the optimum heat-treatment conditions for the formation of secondary phase correlated with coercivity, thereby demonstrating the usefulness of the HT in situ XRD method in the development of high-performance permanent magnets. [ABSTRACT FROM AUTHOR]
ISSN:13459678
DOI:10.2320/matertrans.MT-M2025067